Fix RTSP docs and add a missing release note

* Add release note for `RtspMediaSource.Factory.setTimeoutMs()`
* Remove mention of what we don't support (any such list is necessarily non-exhaustive)
* Remove markdown quote character ('>')

PiperOrigin-RevId: 385143574

RELEASENOTES.md

@@ -69,6 +69,8 @@
         ([#9014](https://github.com/google/ExoPlayer/issues/9014)).
     *   Allow using absolute URI in the control attribute in a media description
         ([#9183](https://github.com/google/ExoPlayer/issues/9183)).
+    *   Allow the timeout to be customised via
+        `RtspMediaSource.Factory.setTimeoutMs`.
 
 ### 2.14.1 (2021-06-11)
 

docs/_page_fragments/supported-formats-rtsp.md

@@ -10,5 +10,3 @@ types are listed below.
 **Supported network types**
 * RTP over UDP unicast (multicast is not supported).
 * Interleaved RTSP, RTP over RTSP using TCP.
-
-> Playback of RTP streams is not supported.

docs/rtsp.md

@@ -68,10 +68,10 @@ The timeout for retrying with TCP can be customized by calling the method
 four seconds, the player will retry with TCP after four seconds of UDP
 inactivity.
 
-> Setting the timeout also affects the end-of-stream detection logic. That is,
+Setting the timeout also affects the end-of-stream detection logic. That is,
 ExoPlayer will report the playback has ended if nothing is received for the
-duration of the set timeout. Setting this value too small may lead to pre-mature
-stream ending under poor network conditions.
+duration of the set timeout. Setting this value too small may lead to an early
+end-of-stream signal under poor network conditions.
 
 ### Force using RTP/TCP ###
 ExoPlayer can also be configured to play with RTP/TCP by default. To do so,