protocol: Correct typo 'suppot'

Signed-off-by: Bryce Harrington <b.harrington@samsung.com>
diff --git a/protocol/fullscreen-shell.xml b/protocol/fullscreen-shell.xml
index 3c2cf3c..939c2ba 100644
--- a/protocol/fullscreen-shell.xml
+++ b/protocol/fullscreen-shell.xml
@@ -49,7 +49,7 @@
 	capability is provided, wl_fullscreen_shell.present_surface_for_mode
 	will almost never fail and clients should feel free to set whatever
 	mode they like.  If the compositor does not advertise this, it may
-	still suppot some modes that are not advertised through wl_global.mode
+	still support some modes that are not advertised through wl_global.mode
 	but it is less likely.
 
 	CURSOR_PLANE: