os/exec: move platform-specific LookPath docs to a common comment

We have four different LookPath variations (unix, windows, plan9, wasm),
each with slightly different doc comments. Unify the documentation and
move it to a single, common LookPath.

Change-Id: I56bae57e80887a73ef0f6933258ee0a48dbccdcf
Reviewed-on: https://go-review.googlesource.com/c/go/+/734320
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
5 files changed
tree: ac9ce1acfea350a81bdb6e1e5d0fff24d2a80406
  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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