Merge pull request #14944 from opf/fix-lefthook-instructions

fix lefthook documentation link

lefthook.yml

@@ -3,7 +3,7 @@
 # Add commit hooks with `bundle exec lefthook install`
 #
 # Refer for explanation to following link:
-# https://github.com/evilmartians/lefthook/blob/master/docs/full_guide.md
+# https://github.com/evilmartians/lefthook/blob/master/docs/usage.md
 
 pre-commit:
   parallel: true