docs: Fix a few typos (#4415)

There are small typos in:
- docs/API.md
- docs/design.md

Fixes:
- Should read `overridden` rather than `overrided`.
- Should read `synchronization` rather than `syncronization`.
- Should read `switch` rather than `swith`.
- Should read `successfully` rather than `succesfully`.
- Should read `predetermined` rather than `predetemined`.
- Should read `adjustments` rather than `adjustements`.

Co-authored-by: Tom Jenkinson <tjenkinson@users.noreply.github.com>

docs/API.md

@@ -437,7 +437,7 @@ A logger object could also be provided for custom logging: `config.debug = custo
 (default -1)
 
 - if set to -1, playback will start from initialTime=0 for VoD and according to `liveSyncDuration/liveSyncDurationCount` config params for Live
-- Otherwise, playback will start from predefined value. (unless stated otherwise in `autoStartLoad=false` mode : in that case startPosition can be overrided using `hls.startLoad(startPosition)`).
+- Otherwise, playback will start from predefined value. (unless stated otherwise in `autoStartLoad=false` mode : in that case startPosition can be overridden using `hls.startLoad(startPosition)`).
 
 ### `defaultAudioCodec`
 
@@ -813,7 +813,7 @@ var customPlaylistLoader = function () {
 };
 ```
 
-if you want to just make slight adjustements to existing loader implementation, you can also eventually override it, see an example below :
+if you want to just make slight adjustments to existing loader implementation, you can also eventually override it, see an example below :
 
 ```js
 // special playlist post processing function
@@ -925,7 +925,7 @@ Enable the default fps controller by setting `capLevelOnFPSDrop` to `true`.
 
 (default: internal track timeline controller)
 
-Customized text track syncronization controller.
+Customized text track synchronization controller.
 
 Parameter should be a class with a `destroy()` method:
 
@@ -1217,7 +1217,7 @@ Calling this method will:
 ## Quality switch Control API
 
 By default, hls.js handles quality switch automatically, using heuristics based on fragment loading bitrate and quality level bandwidth exposed in the variant manifest.
-It is also possible to manually control quality swith using below API.
+It is also possible to manually control quality switch using below API.
 
 ### `hls.levels`
 
@@ -1257,7 +1257,7 @@ Set to `-1` for automatic level selection.
 ### `hls.startLevel`
 
 - get/set: Start level index (level of first fragment that will be played back).
-  - if not overrided by user: first level appearing in manifest will be used as start level.
+  - if not overridden by user: first level appearing in manifest will be used as start level.
   - if -1: automatic start level selection, playback will start from level matching download bandwidth (determined from download of first segment).
 
 Default value is `hls.firstLevel`.
@@ -1387,7 +1387,7 @@ Full list of Events is available below:
 
 - `Hls.Events.MEDIA_ATTACHING` - fired before MediaSource is attaching to media element
   - data: { media }
-- `Hls.Events.MEDIA_ATTACHED` - fired when MediaSource has been succesfully attached to media element
+- `Hls.Events.MEDIA_ATTACHED` - fired when MediaSource has been successfully attached to media element
   - data: { media }
 - `Hls.Events.MEDIA_DETACHING` - fired before detaching MediaSource from media element
   - data: { }

docs/design.md

@@ -162,11 +162,11 @@ design idea is pretty simple :
   - tracks which parts of the buffer is not loaded correctly
   - tracks which parts of the buffer was unloaded by the coded frame eviction algorithm
 - [src/loader/fragment-loader.ts][]
-  - in charge of loading fragments, use xhr-loader if not overrided by user config
+  - in charge of loading fragments, use xhr-loader if not overridden by user config
 - [src/loader/key-loader.ts][]
   - in charge of loading decryption key
 - [src/loader/playlist-loader.ts][]
-  - in charge of loading manifest, and level playlists, use xhr-loader if not overrided by user config.
+  - in charge of loading manifest, and level playlists, use xhr-loader if not overridden by user config.
 - [src/remux/aac-helper.ts][]
   - helper class to create silent AAC frames (useful to handle streams with audio holes)
 - [src/remux/mp4-generator.ts][]
@@ -204,7 +204,7 @@ design idea is pretty simple :
   - logging utils, useful for debug
 - [src/utils/xhr-loader.ts][]
   - XmlHttpRequest wrapper. it handles standard HTTP GET but also retries and timeout.
-  - retries : if xhr fails, HTTP GET will be retried after a predetermined delay. this delay is increasing following an exponential backoff. after a predetemined max number of retries, an error callback will be triggered.
+  - retries : if xhr fails, HTTP GET will be retried after a predetermined delay. this delay is increasing following an exponential backoff. after a predetermined max number of retries, an error callback will be triggered.
   - timeout: if load exceeds max allowed duration, a timeout callback will be triggered. it is up to the callback to decides whether the connection should be cancelled or not.
 
 [src/config.ts]: ../src/config.ts