Fixed typo in documentation.

README-raspberrypi.txt

@@ -124,7 +124,7 @@ Reference: http://www.raspberrypi.org/phpBB3/viewtopic.php?t=5062
 
 The Text Input API is supported, with translation of scan codes done via the
 kernel symbol tables. For this to work, SDL needs access to a valid console.
-If you notice there's no SDL_TEXTINPUT message being emmited, double check that
+If you notice there's no SDL_TEXTINPUT message being emitted, double check that
 your app has read access to one of the following:
 
 * /proc/self/fd/0