cmd/go/internal/doc: reject meta packages in go doc

[raffr85]

Meta-package names such as std, cmd, tool, work, and all are package
patterns that expand to multiple packages, not single documentable
packages. Today go doc std can fall through package resolution and print
documentation for an unrelated first match such as archive/tar.

Reject these names when they are the first argument to go doc, including
the two-argument form such as go doc std Foo. Keep go doc -http std
routing to the standard library page.

Fixes #53446

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[raffr85]

@googlebot rescan

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Patch Set 1:

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[raffr85]

Tests:
env -u GOROOT -u GOTOOLDIR -u GOFLAGS -u GOENV GOTOOLCHAIN=local GODEBUG=goindex=0 ./bin/go test cmd/go/internal/doc -count=1
env -u GOROOT -u GOTOOLDIR -u GOFLAGS -u GOENV GOTOOLCHAIN=local GODEBUG=goindex=0 ./bin/go test cmd/go -run '^TestScript/doc$' -count=1
Tests:
env -u GOROOT -u GOTOOLDIR -u GOFLAGS -u GOENV GOTOOLCHAIN=local GODEBUG=goindex=0 ./bin/go test cmd/go/internal/doc -count=1
env -u GOROOT -u GOTOOLDIR -u GOFLAGS -u GOENV GOTOOLCHAIN=local GODEBUG=goindex=0 ./bin/go test cmd/go -run '^TestScript/doc$' -count=1

[gopherbot]

Message from Rafael Affonso:

Patch Set 2:

(2 comments)

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[gopherbot]

Message from Michael Matloob:

Patch Set 2:

(2 comments)

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[gopherbot]

This PR (HEAD: 3115c9c) has been imported to Gerrit for code review.

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Important tips:

• Don't comment on this PR. All discussion takes place in Gerrit.
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[gopherbot]

Message from Rafael Affonso:

Patch Set 3:

(3 comments)

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