Add a link redirecting questions to the wiki page/forums
Change-Id: I05b784e6bb0c260cb01c4535ad05fb17ba80110e
GitHub-Last-Rev:
a927ce5c69df7854ae919013b0e55ab4d356fc4c
GitHub-Pull-Request: golang/go#36413
Reviewed-on: https://go-review.googlesource.com/c/go/+/213440
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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### What version of Go are you using (`go version`)?
### What did you see instead?
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