gopls/internal/cmd: Improve help texts

[silverwind]

gopls check operates on multiple files, so I made the help text reflect that fact.

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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[gopherbot]

This PR (HEAD: 28b833c) has been imported to Gerrit for code review.

Please visit Gerrit at https://go-review.googlesource.com/c/tools/+/582155.

Important tips:

• Don't comment on this PR. All discussion takes place in Gerrit.
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• See the Sending a change via GitHub and Reviews sections of the Contribution Guide as well as the FAQ for details.

[gopherbot]

Message from Gopher Robot:

Patch Set 1:

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[gopherbot]

Message from silverwind:

Patch Set 2:

(2 comments)

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