Fix documentation syntaxes for RST option-list

http://docutils.sourceforge.net/docs/ref/rst/restructuredtext.html#option-lists

RST only accepts two forms for option argument:
- Begins with a letter and consists of [a-zA-Z0-9_].
- Begins with "<" and ends with ">"; any characters except angle
  brackets are allowed internally.

Updated documents to obey the above rule.

Also cleaned up the documents to follow the syntaxes defined in
http://docopt.org/.

Change-Id: I06c6fa6db524325373053b26fc99169469664f01

docs/source/documentation.rst

@@ -34,7 +34,7 @@ Synopsis
 
 ::
 
-    $ packager {stream_descriptor} [{stream_descriptor}] ... \
+    $ packager <stream_descriptor> ... \
                [--dump_stream_info] \
                [Chunking Options] \
                [MP4 Output Options] \
@@ -65,11 +65,11 @@ Different key providers cannot be specified at the same time.
 
 ::
 
-    [--enable_widevine_encryption {Widevine Encryption Options}] \
-    [--enable_widevine_decryption {Widevine Decryption Options}] \
-    [--enable_raw_key_encryption {Raw Key Encryption Options}] \
-    [--enable_raw_key_decryption {Raw Key Decryption Options}] \
-    [--enable_playready_encryption {PlayReady Encryption Options}]
+    [--enable_widevine_encryption <Widevine Encryption Options>] \
+    [--enable_widevine_decryption <Widevine Decryption Options>] \
+    [--enable_raw_key_encryption <Raw Key Encryption Options>] \
+    [--enable_raw_key_decryption <Raw Key Decryption Options>] \
+    [--enable_playready_encryption <PlayReady Encryption Options>]
 
 .. include:: /options/general_encryption_options.rst
 

docs/source/options/dash_options.rst

@@ -9,31 +9,34 @@ DASH options
     that if segment_template is not specified, shaka-packager always generates
     static mpd regardless of the value of this flag.
 
---mpd_output {file_path}
+--mpd_output <file_path>
 
     MPD output file name.
 
---base_urls {url}[,{url}]...
+--base_urls <comma_separated_urls>
 
-    Comma separated BaseURLs for the MPD. The values will be added  as <BaseURL>
-    element(s) immediately under the <MPD> element.
+    Comma separated BaseURLs for the MPD:
+        **<url>[,<url>]...**.
 
---min_buffer_time {seconds}
+    The values will be added as <BaseURL> element(s) immediately under the <MPD>
+    element.
+
+--min_buffer_time <seconds>
 
     Specifies, in seconds, a common duration used in the definition of the MPD
     Representation data rate.
 
---minimum_update_period {seconds}
+--minimum_update_period <seconds>
 
     Indicates to the player how often to refresh the media presentation
     description in seconds. This value is used for dynamic MPD only.
 
---suggested_presentation_delay {seconds}
+--suggested_presentation_delay <seconds>
 
     Specifies a delay, in seconds, to be added to the media presentation time.
     This value is used for dynamic MPD only.
 
---time_shift_buffer_depth {seconds}
+--time_shift_buffer_depth <seconds>
 
     Guaranteed duration of the time shifting buffer for dynamic media
     presentations, in seconds.
@@ -48,12 +51,14 @@ DASH options
 
     The segments are not removed if the value is zero.
 
---utc_timing {scheme_id_uri}={value}[,{scheme_id_uri}={value}]...
+--utc_timing <scheme_id_uri_value_pairs>
+
+    Comma separated UTCTiming schemeIdUri and value pairs for the MPD:
+        **<scheme_id_uri>=<value>[,<scheme_id_uri>=<value>]...**
 
-    Comma separated UTCTiming schemeIdUri and value pairs for the MPD.
     This value is used for dynamic MPD only.
 
---default_language {language}
+--default_language <language>
 
     Any audio/text tracks tagged with this language will have
     <Role ... value=\"main\" /> in the manifest.  This allows the player to

docs/source/options/raw_key_encryption_options.rst

@@ -13,7 +13,7 @@ Raw key encryption options
 
     **key_info_string** is of the form::
 
-        label={label}:key_id={key_id}:key={key}
+        label=<label>:key_id=<key_id>:key=<key>
 
     *label* can be an arbitrary string or a predefined DRM label like AUDIO,
     SD, HD, etc. Label with an empty string indicates the default key and

docs/source/options/stream_descriptors.rst

@@ -6,7 +6,7 @@ multiple different "files".
 
 Stream descriptor is of the form::
 
-    {field}={value}[,{field}={value}]...
+    <field>=<value>[,<field>=<value>]...
 
 These are the available fields:
 

docs/source/options/udp_file_options.rst

@@ -3,7 +3,7 @@ UDP file options
 
 UDP file is of the form::
 
-    udp://{ip}:{port}[?{option}[&{option}]...]
+    udp://<ip>:<port>[?<option>[&<option>]...]
 
 Here is the list of supported options:
 
@@ -11,17 +11,17 @@ Here is the list of supported options:
 
     Allow or disallow reusing UDP sockets.
 
-:interface={addr}:
+:interface=<addr>:
 
     Multicast group interface address. Only the packets sent to this address are
     received. Default to "0.0.0.0" if not specified.
 
-:source={addr}:
+:source=<addr>:
 
     Multicast source ip address. Only the packets sent from this source address
     are received. Enables Source Specific Multicast (SSM) if set.
 
-:timeout={microseconds}:
+:timeout=<microseconds>:
 
     UDP timeout in microseconds.
 

docs/source/tutorials/dash.rst

@@ -14,8 +14,8 @@ Synopsis
 
 ::
 
-    $ packager {stream_descriptor} [stream_descriptor] ... \
-      --mpd_output {manifest output path} \
+    $ packager <stream_descriptor> ... \
+      --mpd_output <manifest_output_path> \
       [Other DASH options] \
       [Other options, e.g. DRM options, HLS options]
 

docs/source/tutorials/hls.rst

@@ -23,9 +23,8 @@ Synopsis
 
 ::
 
-    $ packager {stream_descriptor with HLS specific descriptors} \
-               [stream_descriptor with HLS specific descriptors] ... \
-      --hls_master_playlist_output {master playlist output path} \
+    $ packager <stream_descriptor> ... \
+      --hls_master_playlist_output <master_playlist_output_path> \
       [Other HLS options] \
       [Other options, e.g. DRM options, DASH options]
 

docs/source/tutorials/raw_key.rst

@@ -8,15 +8,15 @@ Synopsis
 
 ::
 
-    $ packager {stream_descriptor} [stream_descriptor] ... \
+    $ packager <stream_descriptor> ... \
       --enable_raw_key_encryption \
-      --keys <key_info_string[,key_info_string][,key_info_string]...> \
-      [--pssh <concatenated PSSHs>] \
+      --keys <key_info_string>[,<key_info_string>]... \
+      [--pssh <concatenated_PSSHs>] \
       [Other options, e.g. DASH options, HLS options]
 
 **key_info_string** is of the form::
 
-    label={label}:key_id={key_id}:key={key}
+    label=<label>:key_id=<key_id>:key=<key>
 
 Custom PSSH(s) can be provided in *--pssh*. If absent,
 `v1 common PSSH box <https://goo.gl/s8RIhr>`_ is generated.

docs/source/tutorials/widevine.rst

@@ -15,7 +15,7 @@ Synopsis
 
 AES signing::
 
-    $ packager {stream_descriptor} [stream_descriptor] ... \
+    $ packager <stream_descriptor> ... \
       --enable_widevine_encryption \
       --key_server_url <key_server_url> \
       --content_id <content_id> \
@@ -25,7 +25,7 @@ AES signing::
 
 RSA signing::
 
-    $ packager {stream_descriptor} [stream_descriptor] ... \
+    $ packager <stream_descriptor> ... \
       --enable_widevine_encryption \
       --key_server_url <key_server_url> \
       --content_id <content_id> \