cmd/go: correctly suggest tidy instead of nonexistent fix for -fix

[y-yagi]

CL 129682 removed go mod fix but unfortunately
we hadn't updated the source code hence running
go mod -fix
would suggest
go mod fix
which is a nonexistent command.

This change fixes that to instead suggest
go mod tidy

[gopherbot]

This PR (HEAD: eab1e55) has been imported to Gerrit for code review.

Please visit https://go-review.googlesource.com/c/go/+/144838 to see it.

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[gopherbot]

Message from Emmanuel Odeke:

Patch Set 1:

(2 comments)

Thanks for working on this Yuji!
I've added some suggestions for the commit message and for the fix.

Just in case you might not have seen, please make your commit message
edits on Github as per https://github.com/golang/go/wiki/CommitMessage#github-pull-requests
so that the changes can reflect here.
Thank you!

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[gopherbot]

This PR (HEAD: 5ae1340) has been imported to Gerrit for code review.

Please visit https://go-review.googlesource.com/c/go/+/144838 to see it.

Tip: You can toggle comments from me using the comments slash command (e.g. /comments off)
See the Wiki page for more info

[gopherbot]

Message from Yuji Yaginuma:

Patch Set 2:

Thanks for your review!

I updated fix and commit message. Thanks!

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[gopherbot]

Message from Emmanuel Odeke:

Patch Set 2:

Patch Set 2:

Thanks for your review!

I updated fix and commit message. Thanks!

Thanks Yuji. I don't know if you saw my message in https://go-review.googlesource.com/c/go/+/144838/2#message-ca45c6b738a0aad141a4d1f38fcfd9670aba2733
but anyways to update the commit message and get it to reflect on Gerrit, you'll need to manually go edit the Github PR as per https://github.com/golang/go/wiki/CommitMessage#github-pull-requests. Once that is up, then LGTM.

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[gopherbot]

Message from Emmanuel Odeke:

Patch Set 4: Run-TryBot+1 Code-Review+2

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[gopherbot]

Message from Gobot Gobot:

Patch Set 4:

TryBots beginning. Status page: https://farmer.golang.org/try?commit=e8f7e221

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[gopherbot]

Message from Emmanuel Odeke:

Patch Set 4:

Patch Set 2:

Patch Set 2:

Thanks for your review!

I updated fix and commit message. Thanks!

Thanks Yuji. I don't know if you saw my message in https://go-review.googlesource.com/c/go/+/144838/2#message-ca45c6b738a0aad141a4d1f38fcfd9670aba2733
but anyways to update the commit message and get it to reflect on Gerrit, you'll need to manually go edit the Github PR as per https://github.com/golang/go/wiki/CommitMessage#github-pull-requests. Once that is up, then LGTM.

Yuji, never mind, I made the edit on Github itself :)

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[gopherbot]

Message from Gobot Gobot:

Patch Set 4: TryBot-Result+1

TryBots are happy.

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[gopherbot]

This PR is being closed because golang.org/cl/144838 has been merged.