[DOCATT-104141] Clarified where experimental settings are (#667)

* Clarified where experimental settings are

* Apply suggestion from @u-pr[bot]

Co-authored-by: u-pr[bot] <205906871+u-pr[bot]@users.noreply.github.com>

---------

Co-authored-by: u-pr[bot] <205906871+u-pr[bot]@users.noreply.github.com>

Author: JonMUnity

Documentation~/experimental.md

@@ -8,4 +8,8 @@ ProBuilder includes three experimental features:
 
 These features are still under development; they're not fully tested, and might reduce ProBuilder's stability. They are disabled by default; use them with caution.
 
-To enable experimental features, in the main menu, go to **Unity** > **Settings** > **ProBuilder** and enable **Experimental Features Enabled**.
+To enable experimental features:
+
+1. In the main menu, go to **Edit** > **Preferences** (macOS: **Unity** > **Settings**).
+1. Select the **ProBuilder** tab. 
+1. In the **ProBuilder** tab, enable **Experimental Features Enabled**.