Add missing send-event mode to sway-input(5)
Also, fix a small typo.
@@ -30,7 +30,7 @@ Commands
**input** <identifier> dwt <enabled|disabled>::
Enables or disables disable-while-typing for the specified input device.
-**input** <identifier> events <enable|disabled>::
+**input** <identifier> events <enabled|disabled|disabled_on_external_mouse>::
Enables or disables send_events for specified input device.
(Disabling send_events disables the input device)
