Remove redundant "also known as" for MediaRecorder (#3252)

This name is already at the start of the description.

Author: foolip

features/mediastream-recording.yml

@@ -1,5 +1,5 @@
 name: MediaStream recording
-description: The `MediaRecorder` API captures data generated by `MediaStream` or `HTMLMediaElement` objects for analysis, processing, or saving to disk. Also known as the Media Recording API or the MediaRecorder API.
+description: The `MediaRecorder` API captures data generated by `MediaStream` or `HTMLMediaElement` objects for analysis, processing, or saving to disk. Also known as the Media Recording API.
 spec: https://w3c.github.io/mediacapture-record/
 compat_features:
   - api.BlobEvent