[release-branch.go1.14] cmd/go: update 'go help modules' for automatic vendoring

* Mention vendor/modules.txt verification with -mod=vendor.
* Update "Modules and vendoring" section.

Fixes #37931

Change-Id: Ia3ee72457daabaa2fc15b7ea7427eb324c088b8f
Reviewed-on: https://go-review.googlesource.com/c/go/+/223926
Run-TryBot: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
(cherry picked from commit b816cb2cd5f1b7cee660c6e4b85d8130b960752a)
Reviewed-on: https://go-review.googlesource.com/c/go/+/224119
TryBot-Result: Gobot Gobot <gobot@golang.org>
2 files changed
tree: a7ce2a12332af49c702ae9d22dccf6c217c9b3c0
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
  18. SECURITY.md
  19. VERSION
README.md

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