minor #13857 Update input.rst (atailouloute)

This PR was merged into the 5.0 branch.

Discussion
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Update input.rst

Starting from SF5.0, the `Command::execute`  should return an int

Commits
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cd71bb0 Update input.rst

Author: javiereguiluz

console/input.rst

@@ -52,6 +52,8 @@ You now have access to a ``last_name`` argument in your command::
             }
 
             $output->writeln($text.'!');
+            
+            return 0;
         }
     }