[webrtc-pc] new commits pushed by aboba

The following commits were just pushed by aboba to https://github.com/w3c/webrtc-pc:

* operation: add subsections

adds subsections to the RTCPeerConnection operations description
to make the individial operations linkable.

fixes #1190
  by Philipp Hancke
https://github.com/w3c/webrtc-pc/commit/c6e985068765410e4e474a647014f804602d6349

* Merge pull request #1222 from fippo/operation-subsections

operation: add subsections
  by Bernard Aboba
https://github.com/w3c/webrtc-pc/commit/5161df81753e14023f88af3522ad2afbef18d2c9