gopls/doc: fix broken link

Change-Id: I051824d44b12bbdb3bff41ff97d8583d841810e2
GitHub-Last-Rev: 7fb731de225440bdf98ad0130cf1b9010cac3e17
GitHub-Pull-Request: golang/tools#314
Reviewed-on: https://go-review.googlesource.com/c/tools/+/313096
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
Trust: Rebecca Stambler <rstambler@golang.org>
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
diff --git a/gopls/doc/workspace.md b/gopls/doc/workspace.md
index ed30dae..821ba49 100644
--- a/gopls/doc/workspace.md
+++ b/gopls/doc/workspace.md
@@ -23,7 +23,7 @@
 will need to create a "workspace folder" for each module. This means that each
 module has its own scope, and features will not work across modules. We are
 currently working on addressing this limitation--see details about
-[experimental workspace module mode](#experimental-workspace-module-mode)
+[experimental workspace module mode](#workspace-module-experimental)
 below.
 
 In VS Code, you can create a workspace folder by setting up a