Fix typo

s/Warg/Warn/

Author: hexmode

php-mode.el

@@ -349,7 +349,7 @@ Turning this on will force PEAR rules on all PHP files."
 mumamo-mode turned on. Detects if there are any HTML tags in the
 buffer before warning, but this is is not very smart; e.g. if you
 have any tags inside a PHP string, it will be fooled."
-  :type '(choice (const :tag "Warg" t) (const "Don't warn" nil)))
+  :type '(choice (const :tag "Warn" t) (const "Don't warn" nil)))
 
 (defcustom php-mode-coding-style 'pear
   "Select default coding style to use with php-mode.