Amazingly, we seem to have nearly no in-tree documentation on the
semantics of block and mutex profiles. Add brief summaries, including
the new behavior from CL 506415 and CL 544195.
For #14689.
For #44920.
For #57071.
For #61015.
Change-Id: I1a6edce7c434fcb43f17c83eb362b1f9d1a32df1
Reviewed-on: https://go-review.googlesource.com/c/go/+/547057
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Rhys Hiltner <rhys@justin.tv>
Auto-Submit: Michael Pratt <mpratt@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>