cmd/dist: add doc file to fix go doc dist

$ go tool -h says:

  For more about each tool command, see 'go tool command -h'.

but it was suggested to change the suggestion to say:

  see 'go doc command'

In #18313.

That would work for every tool except dist, which has no doc.go.

This change adds a doc.go file to cmd/dist.

Updates #18313

Change-Id: If67a21934b87647a69359d9c14d8de3775c587b7
Reviewed-on: https://go-review.googlesource.com/54351
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
1 file changed
tree: 3d3b0e196687e26c8fe35bcea64120f63691e701
  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
README.md

The Go Programming Language

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