manpage: unmark d3d11va as "experimental"

Also add missing mediacodec entry.

DOCS/man/options.rst

@@ -588,8 +588,9 @@ Video
     :dxva2: requires ``--vo=opengl:backend=angle`` or
         ``--vo=opengl:backend=dxinterop`` (Windows only)
     :dxva2-copy: copies video back to system RAM (Windows only)
-    :d3d11va: experimental, requires ``--vo=opengl:backend=angle`` (Windows only)
-    :d3d11va-copy: experimental (Windows only)
+    :d3d11va: requires ``--vo=opengl:backend=angle`` (Windows only)
+    :d3d11va-copy: copies video back to system RAM (Windows only)
+    :mediacodec: copies video back to system RAM (Android only)
     :rpi:       requires ``--vo=rpi`` (Raspberry Pi only - default if available)
 
     ``auto`` tries to automatically enable hardware decoding using the first