runtime,runtime/metrics: clarify OS stack metrics

There are some subtle details here about measuring OS stacks in cgo
programs. There's also an expectation about magnitude in the MemStats
docs that isn't in the runtime/metrics docs. Fix both.

Fixes #54396.

Change-Id: I6b60a62a4a304e6688e7ab4d511d66193fc25321
Reviewed-on: https://go-review.googlesource.com/c/go/+/502156
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
3 files changed
tree: 9bd3fd75efe6bfbf86f1ac0b2502356875d2b49e
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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