src/main.rs: update Checkout subcommand doc

src/main.rs

@@ -39,10 +39,9 @@ enum Commands {
         long_about = "Create github hooks to use gbl automaticaly after commit, \
     before and after checkout \n \n\
     This command should be used after git init and glb init. \n \n\
-    This will create 3 hooks file: \n\
+    This will create 2 hooks file: \n\
     1. post-commit: `glb commit` will be launched after git commit \n\
-    2. pre-checkout: `glb pre-co` will be launched before git checkout \n\
-    3. post-checkout: `gbl checkout` will be launched after git checkout
+    2. post-checkout: `gbl checkout` will be launched after git checkout
      "
     )]
     CreateHooks(CreateHooks),