Update the upgrade guides for v2.1

Also changes the jsdoc template for tutorials with children, to give
the tutorial content itself control over how the links to children are
formatted.

Also fixes annotations for the TextParser interface.

Change-Id: I99502f38bf711b74a596ad804d8abdddee5d6f4d

docs/tutorials/index.json

@@ -7,13 +7,15 @@
   { "drm-config": { "title": "DRM Configuration" } },
   { "license-server-auth": { "title": "License Server Authentication" } },
   { "license-wrapping": { "title": "License Wrapping" } },
-  { "Coming Soon": { "children": [
-    { "live": { "title": "Special Considerations for Live Streaming" } },
-    { "offline": { "title": "Offline Storage and Playback" } }
-  ] } },
   { "plugins": { "title": "Plugins and Customizing the Build" } },
   { "manifest-parser": { "title": "Manifest Parser Plugins" } },
   { "architecture": { "title": "Architecture Diagrams" } },
   { "service-worker": { "title": "Service Worker Caching" } },
-  { "upgrade": { "title": "Shaka v2 Upgrade Guide" } }
+  { "upgrade": {
+      "title": "Upgrade Guide",
+      "children": {
+        "upgrade-v1": { "title": "Upgrade Guide, v1 => v2.1" },
+        "upgrade-v2-0": { "title": "Upgrade Guide, v2.0 => v2.1" }
+      }
+  } }
 ]

docs/tutorials/plugins.md

@@ -28,12 +28,16 @@ __Manifest parsers__
     and {@link shaka.media.ManifestParser.registerParserByMime}
   - Default manifest parser plugins:
     - DASH: {@linksource shaka.dash.DashParser}
+    - HLS: {@linksource shaka.hls.HlsParser}
 
 __Subtitle/caption parsers__
   - Selected by MIME type
   - Register with {@link shaka.media.TextEngine.registerParser}
   - Default text parser plugins:
-    - WebVTT: {@linksource shaka.media.VttTextParser}
+    - WebVTT: {@linksource shaka.media.VttTextParser} and
+      {@linksource shaka.media.Mp4VttParser}
+    - TTML: {@linksource shaka.media.TtmlTextParser} and
+      {@linksource shaka.media.Mp4TtmlParser}
 
 __Networking plugins__
   - Selected by URI scheme (http, https, etc.)
@@ -59,6 +63,8 @@ __Polyfills__
     - prefixed EME implementations for IE 11 and very old versions of embedded
       Chrome/Chromium: {@linksource shaka.polyfill.MediaKeys}
     - Promise implementation for IE 11: {@linksource shaka.polyfill.Promise}
+    - variants of VTTCue and TextTrackCue constructors:
+      {@linksource shaka.polyfill.VTTCue}
 
 
 #### Excluding Default Plugins
@@ -68,7 +74,7 @@ technically optional.  For example, if you don't need WebVTT, you can exclude
 our VTT parser from the build to save space.  Any VTT text streams found in a
 manifest would then be ignored.
 
-*(At the time of this writing, our default plugins account for 43% of the size
+*(At the time of this writing, our default plugins account for 54% of the size
 of our compiled library.)*
 
 Because each plugin's source file ends with a call to register itself with the