MediaRecorder:add note for setMaxFileSize/Duration

Added note about the side effects of setting a very large file size and duration using methods
setMaxFileSize and setMaxDuration respectively.

Bug: 62071579

Test: make offline-sdk-docs
      Added notes were visible in MediaRecorder.html

Change-Id: I7542da0bb55af286ac0c4c736ef783d8f4a4918a