cmd/go: revise 'go help' documentation for modules

Module-related help pages now contain a brief summary and point to the
reference documentation at golang.org/ref/mod for details.

Help pages for commands like 'go get' still describe the basic usage
and summarize flags but don't provide as much background detail.

Fixes #41427
Fixes #43419

Change-Id: Icacd38e0f33c352c447cc5a496c99674493abde2
Reviewed-on: https://go-review.googlesource.com/c/go/+/282615
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
16 files changed
tree: 2e1ef169a3249cb354eb776c2619d175aaa8f085
  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
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