x/build/version/go1.11beta1 release notes "file does not exist"

[smasher164]

There is no document at the referenced url:

See the release notes at https://golang.org/doc/go1.11beta1

I presume the source file x/build/version/go1.11beta1/main.go was generated by x/build/version/internal/genv.

However, there are release notes at https://tip.golang.org/doc/go1.11. Should the file reference this url instead?

[gopherbot]

Change https://golang.org/cl/122409 mentions this issue: x/build/version/go1.11beta1: Change URL for release notes.