Adds full description for AudioEffectRecord.xml

(cherry picked from commit 718221a2ffd75765d875623a4d3064e1e9120aae)

doc/classes/AudioEffectRecord.xml

@@ -4,6 +4,7 @@
 		Audio effect used for recording sound from a microphone.
 	</brief_description>
 	<description>
+		Allows the user to record sound from a microphone. It sets and gets the format in which the audio file will be recorded (8-bit, 16-bit, or compressed). It checks whether or not the recording is active, and if it is, records the sound. It then returns the recorded sample.
 	</description>
 	<tutorials>
 		<link>https://docs.godotengine.org/en/latest/tutorials/audio/recording_with_microphone.html</link>