Small fixes to the installation guide and check task

doc/install/installation.md

@@ -147,7 +147,7 @@ Fix the directory permissions for the repositories:
     # Make sure the repositories dir is owned by git and it stays that way
     sudo chmod -R ug+rwX,o-rwx /home/git/repositories/
     sudo chown -R git:git /home/git/repositories/
-    find /home/git/repositories -type d -print0 | sudo xargs -0 chmod g+s 
+    find /home/git/repositories -type d -print0 | sudo xargs -0 chmod g+s
 
 
 ## Add domains to list to the list of known hosts

lib/tasks/gitlab/check.rake

@@ -730,7 +730,7 @@ namespace :gitlab do
         puts "no".red
         try_fixing_it(
           "sudo chmod -R ug+rwX,o-rwx #{repo_base_path}",
-          "sudo chmod -R u-s #{repo_base_path}",
+          "sudo chmod -R ug-s #{repo_base_path}",
           "find #{repo_base_path} -type d -print0 | sudo xargs -0 chmod g+s"
         )
         for_more_information(