spec update from https://github.com/w3c/webrtc-stats/pull/744 BUG=webrtc:14989 Change-Id: I9d0adcf951501bc281054c77bb6bc03e47192523 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/295505 Reviewed-by: Henrik Boström <hbos@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Philipp Hancke <phancke@microsoft.com> Cr-Commit-Position: refs/heads/main@{#39575}