Convert com.android.media.remotedisplay.stubs-gen docs

Checked AOSP master, and found that this module haven't been migrated
yet after pi-dev codebase been merged back to AOSP.

Test: m -j RemoteDisplayProviderTest is successful and does not show any
link-type check warning.
Bug: b/70351683

Change-Id: I227fe8c0a19582cf3f095a8e773ca0bdd81b0a0a