Fix typo

Summary: 'daeons' to 'daemons'

Test Plan: run `phd help`

Reviewers: #blessed_reviewers, epriestley

Reviewed By: epriestley

CC: epriestley, aran

Differential Revision: https://secure.phabricator.com/D7973

scripts/daemon/manage_daemons.php

@@ -10,7 +10,7 @@ $args = new PhutilArgumentParser($argv);
 $args->setTagline('manage daemons');
 $args->setSynopsis(<<<EOSYNOPSIS
 **phd** __command__ [__options__]
-    Manage Phabricator daeons.
+    Manage Phabricator daemons.
 
 EOSYNOPSIS
   );