docs: add mentions of the Vulkan rendering abstraction replacement

From internal to libplacebo.

DOCS/interface-changes.rst

@@ -78,6 +78,8 @@ Interface changes
       If --demuxer-thread=no is used, there are no guarantees.
     - remove `--macos-title-bar-style`, replaced by `--macos-title-bar-material`
       and `--macos-title-bar-appearance`.
+    - The default for `--vulkan-async-compute` has changed to `yes` from `no`
+      with the move to libplacebo as the back-end for vulkan rendering.
  --- mpv 0.29.0 ---
     - drop --opensles-sample-rate, as --audio-samplerate should be used if desired
     - drop deprecated --videotoolbox-format, --ff-aid, --ff-vid, --ff-sid,

RELEASE_NOTES

@@ -1,3 +1,55 @@
+Release 0.30.0
+==============
+
+This release has replaced the internal Vulkan rendering abstraction
+with libplacebo's more up-to-date implementation.
+
+Features
+--------
+
+Added
+~~~~~
+
+- vo_gpu: Vulkan API implementation based on libplacebo.
+
+Changed
+~~~~~~~
+
+
+Deprecated
+~~~~~~~~~~
+
+
+Removed
+~~~~~~~
+
+- vo_gpu: Internal Vulkan API implementation.
+
+
+Options and Commands
+--------------------
+
+Added
+~~~~~
+
+
+Changed
+~~~~~~~
+
+
+Deprecated
+~~~~~~~~~~
+
+
+Removed
+~~~~~~~
+
+
+Fixes and Minor Enhancements
+----------------------------
+
+
+
 Release 0.29.0
 ==============