cmd/doc: -src flag misbehaves on some systems [1.14 backport]

[adg]

Under go1.14.2, if you run go doc -src strings.Compare on macOS you get a bunch of unrelated comments.

Commit 585e31d fixes this issue, but it is not applied in the current release (go1.14.2). It would be great to get this trivial fix cherry picked into the next point release.

(Apologies if I should be using @gopherbot to create this issue; I would have but there wasn't a corresponding issue for the original fix.)

[andybons]

Approved as this is a minor change with no workaround.

[andybons]

@adg can you create the cherry-pick CL (per https://golang.org/wiki/MinorReleases) and add me as a reviewer?

[adg]

Note that only the authors of the original CL (or maintainers with the "impersonate" permission) have the ability to create the cherry-pick.

I don't have that permission anymore it seems. :)

[gopherbot]

Change https://golang.org/cl/235579 mentions this issue: [release-branch.go1.14] cmd/doc: fix merging comments in -src mode

[gopherbot]

Closed by merging a68b7d3 to release-branch.go1.14.