_content/doc: fix broken link in go-get-install-deprecation.md

Fixes golang/go#48046.

Change-Id: I237ffa34fb4e9273cb245066a7251a74186390c5
GitHub-Last-Rev: 2d49ff8b47878b3c049ff828fee3f1d9d1a4095e
GitHub-Pull-Request: golang/website#86
Reviewed-on: https://go-review.googlesource.com/c/website/+/346069
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Website-Publish: DO NOT USE <dmitshur@google.com>

_content/doc/go-get-install-deprecation.md

@@ -42,7 +42,7 @@ version. If that module has a `go.mod` file, it must not contain directives like
 `replace` or `exclude` that would cause it to be interpreted differently if it
 were the main module.
 
-See [`go install`](#/ref/mod#go-install) for details.
+See [`go install`](/ref/mod#go-install) for details.
 
 ## Why this is happening