i actually redid the mirror procedure with this setting enabled to see
if this commit will overwrite a test commit I just did on the wiki,
let's see...

service/documentation.md

@@ -127,7 +127,7 @@ into a separate project.
      * **Authentication method**: `Password` (default)
      * **Password**: the **Access token** you created in the first
        step
-     * **Keep divergent refs**: unchecked (optional, should make sure
+     * **Keep divergent refs**: checked (optional, should make sure
        sync works in some edge cases)
      * **Mirror only protected branches**: checked (to keep merge
        requests from being needlessly mirrored to the wiki)