Fix broken link in vgo proposal

[h8liu]

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This PR (HEAD: 8dd0586) has been imported to Gerrit for code review.

Please visit https://go-review.googlesource.com/#/c/proposal/+/102475 to see it.

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Patch Set 1:

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Message from Brad Fitzpatrick:

Patch Set 2: Commit message was updated.

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Message from Brad Fitzpatrick:

Patch Set 2: Code-Review+2

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Please don’t reply on this GitHub thread. Visit golang.org/cl/102475.
After addressing review feedback, remember to publish your drafts!