runtime: fix nStackRoots comment about stack roots
A comment in mgcmark.go indicates that we scan stacks a second time but we don't, at least not since changing to the hybrid write barrier. Change-Id: I9376adbb6d8b6dd9dc3cee62e077b5dfb8a3fdde Reviewed-on: https://go-review.googlesource.com/c/go/+/279797 Trust: Michael Knyszek <mknyszek@google.com> Reviewed-by:Michael Pratt <mpratt@google.com> Reviewed-by:
Austin Clements <austin@google.com>
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