docs: Fixed outdated info and typos (#3206)

Change-Id: I358806b67de5b26e3e03cb092c9e451fe1cfdbf5

CONTRIBUTING.md

@@ -5,8 +5,7 @@ just a few small guidelines you need to follow.
 
 1. File a bug at https://github.com/google/shaka-player/issues (if there isn't
    one already).  If your patch is going to be large, you should start a
-   discussion on the mailing list first to make sure it is in line with our
-   design.
+   discussion on GitHub first.
 
 2. For legal reasons, all contributors must sign a Contributor License
    Agreement, either for an individual or corporation, before a patch can be

docs/tutorials/ad_monetization.md

@@ -174,7 +174,7 @@ adManager.addEventListener(shaka.ads.AdManager.AD_STARTED, (e) => {
 
 [full list of ad events]: https://shaka-player-demo.appspot.com/docs/api/shaka.ads.AdManager.html#.event:AdBreakReadyEvent
 
-#### Accomodating IMA Power Users
+#### Accommodating IMA Power Users
 If you have an existing IMA integration you want to plug into Shaka, or you want
 to use more intricate SDK capabilities not exposed through our API, we provide a
 way to do that.

docs/tutorials/plugins.md

@@ -159,7 +159,7 @@ group file.  For example:
 -@networking
 # Add my custom HTTP implementation
 +/path/to/my_http_plugin.js
-# Add an additional polyfill for some odd platform I'm targetting
+# Add an additional polyfill for some odd platform I'm targeting
 +/path/to/my_platform_polyfill.js
 ```
 

docs/tutorials/ui-customization.md

@@ -89,7 +89,7 @@ ui.configure(config);
 An important note: the 'overflow_menu' button needs to be part of the 'controlPanelElements'
 layout for the overflow menu to be available to the user.
 
-The presense of the seek bar and the big play button in the center of the video element can be
+The presence of the seek bar and the big play button in the center of the video element can be
 customized with `addSeekBar` and `addBigPlayButton` booleans in the config.
 
 UI layout can be reconfigured at any point after it's been created.

docs/tutorials/upgrade-v2-4.md

@@ -187,7 +187,7 @@ The config field `manifest.dash.defaultPresentationDelay` has been moved to
 v4.0.  Applications using this field SHOULD update to use the new location.
 
 The `manifest.defaultPresentationDelay` field now affects both DASH and HLS
-content.  The default value is `0`, which is interpretted differently for DASH
+content.  The default value is `0`, which is interpreted differently for DASH
 and HLS:
 
  - In DASH, `0` means a default of `1.5 * minBufferTime`.
@@ -423,7 +423,7 @@ The `Cue` objects consumed by `TextDisplayer` have changed in v2.5 and v3.0.
 
  - `Cue.writingDirection` has been split into `Cue.writingMode` and
    `Cue.direction` to fix bugs in the handling of these attributes
- - `Cue.size` now defaults to `0`, which should be interpretted as "auto" (fit
+ - `Cue.size` now defaults to `0`, which should be interpreted as "auto" (fit
    to text).
 
 All application-specific TextDisplayer plugins MUST be updated.

docs/tutorials/upgrade-v2-5.md

@@ -193,7 +193,7 @@ The config field `manifest.dash.defaultPresentationDelay` has been moved to
 v4.0.  Applications using this field SHOULD update to use the new location.
 
 The `manifest.defaultPresentationDelay` field now affects both DASH and HLS
-content.  The default value is `0`, which is interpretted differently for DASH
+content.  The default value is `0`, which is interpreted differently for DASH
 and HLS:
 
  - In DASH, `0` means a default of `1.5 * minBufferTime`.
@@ -359,7 +359,7 @@ See {@link shaka.extern.AbrManager} for details.
 
 The `Cue` objects consumed by `TextDisplayer` have changed in v3.0.
 
- - `Cue.size` now defaults to `0`, which should be interpretted as "auto" (fit
+ - `Cue.size` now defaults to `0`, which should be interpreted as "auto" (fit
    to text).
 
 All application-specific TextDisplayer plugins MUST be updated.