update docs for server.sendFile
update docs for server.sendFile

gcoonrod/actionhero,actionhero/actionhero,chimmelb/actionhero,witem/actionhero,witem/actionhero,actionhero/actionhero,witem/actionhero,chimmelb/actionhero,crrobinson14/actionhero,actionhero/actionhero,crrobinson14/actionhero,gcoonrod/actionhero,chimmelb/actionhero,gcoonrod/actionhero,crrobinson14/actionhero,witem/actionhero,gcoonrod/actionhero,actionhero/actionhero