docs: Update docs for v4.6 release (#5885)

docs/tutorials/upgrade.md

@@ -99,3 +99,6 @@ application:
 
   - Plugin changes:
     - `Transmuxer` plugins now has three new parameters in `transmux()` method.
+
+  - Player API Changes:
+    - The constructor no longer takes `mediaElement` as a parameter; use the `attach` method to attach to a media element instead. (Deprecated in v4.6)

maintained-branches.md

@@ -2,8 +2,8 @@
 
 We are currently maintaining the following branches of Shaka Player:
 
- - v4.5 (latest)
- - v4.4 (previous)
+ - v4.6 (latest)
+ - v4.5 (previous)
  - v4.3 (in use by the Cast Application Framework)
  - No active LTS branches at this time
 

roadmap.md

@@ -13,18 +13,28 @@ Candidate features for future release cycles:
    https://github.com/shaka-project/shaka-player/issues/1030
  - Background fetch for offline storage
    https://github.com/shaka-project/shaka-player/issues/879
+ - A method to stitch together clips
+   https://github.com/shaka-project/shaka-player/issues/764
+ - Predict next segment in DASH SegmentTimeline
+   https://github.com/shaka-project/shaka-player/issues/898
  - Smaller, more modular binary
 
-v4.6 - 2024 Q1
- - Content Steering
-   https://github.com/shaka-project/shaka-player/issues/5704
+v5.0 - 2024 Q1
  - Preload API
    https://github.com/shaka-project/shaka-player/issues/880
+ - Common Media Server Data (CMSD)
+   https://github.com/shaka-project/shaka-player/issues/5890
+
+=====
+
+v4.6 - 2023 Q4
+ - Content Steering
+   https://github.com/shaka-project/shaka-player/issues/5704
  - New DASH protocol for Low Latency.
  - ManagedMediaSource
    https://github.com/shaka-project/shaka-player/issues/5271
-
-=====
+ - Add thumbnails support in src=
+ - Remove state engine
 
 v4.5 - 2023 Q4
  - Built-in transmuxer support for muxed content streams (audio+video)