_content/doc: fix go mod edit link in mod.md

Change-Id: I979dcf6b9e097abc70affdf222fd5b7e296a3fd2
Reviewed-on: https://go-review.googlesource.com/c/website/+/291869
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>

_content/doc/mod.md

@@ -353,7 +353,7 @@ The `go.mod` file is designed to be human readable and machine writable. The
 example, [`go get`](#go-get) can upgrade or downgrade specific dependencies.
 Commands that load the module graph will [automatically
 update](#go-mod-file-updates) `go.mod` when needed. [`go mod
-edit`](#go-mod-tidy) can perform low-level edits.  The
+edit`](#go-mod-edit) can perform low-level edits.  The
 [`golang.org/x/mod/modfile`](https://pkg.go.dev/golang.org/x/mod/modfile?tab=doc)
 package can be used by Go programs to make the same changes programmatically.