Fix apparent copy/paste error in comment (PeerConnection)

s/Start/Stop (and other nits)

TBR=stefan@webrtc.org

Bug: webrtc:8111
Change-Id: I4a2ee6d77ddd1ba34a905f861f579f2b2dc29105
Reviewed-on: https://webrtc-review.googlesource.com/7282
Reviewed-by: Elad Alon <eladalon@webrtc.org>
Reviewed-by: Björn Terelius <terelius@google.com>
Commit-Queue: Elad Alon <eladalon@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20186}
diff --git a/pc/peerconnection.h b/pc/peerconnection.h
index df5085b..fa06c3d 100644
--- a/pc/peerconnection.h
+++ b/pc/peerconnection.h
@@ -438,10 +438,10 @@
       int candidate_pool_size,
       bool prune_turn_ports);
 
-  // Starts recording an Rtc EventLog using the supplied platform file.
+  // Starts recording an RTC event log using the supplied platform file.
   // This function should only be called from the worker thread.
   bool StartRtcEventLog_w(rtc::PlatformFile file, int64_t max_size_bytes);
-  // Starts recording an Rtc EventLog using the supplied platform file.
+  // Stops recording an RTC event log.
   // This function should only be called from the worker thread.
   void StopRtcEventLog_w();