docs: fix more broken links in environment.md

Author: mjcheetham

docs/environment.md

@@ -404,7 +404,7 @@ Specify which authentication flow should be used when performing Microsoft authe
 
 Defaults to `auto`.
 
-**Note:** If [`GCM_MSAUTH_USEBROKER`](#gcm_msauth_usebroker) is set to `true`
+**Note:** If [`GCM_MSAUTH_USEBROKER`](#gcm_msauth_usebroker-experimental) is set to `true`
 and the operating system authentication broker is available, all flows will be
 delegated to the broker. If both of those things are true, then the value of
 `GCM_MSAUTH_FLOW` has no effect.