change title of mirror fork card

external/contribute/mirror-fork/mirror-fork.md

@@ -6,7 +6,7 @@ redirect_from:
   - /cards/contribute:mirror-fork
   - /external/cards/contribute:mirror-fork
 ---
-# How to mirror your fork automatically
+# Mirror fork automatically
 
 In order to keep your fork up-to-date automatically with the main (also called `upstream`) repository,
 you should follow the follow simple steps.