doc: fix console doc typo

Signed-off-by: Thadeu Lima de Souza Cascardo <[e-mail]>
Signed-off-by: Jiri Kosina <[e-mail]>

Documentation/console/console.txt

···
 hand, will bind the driver to the consoles that are currently occupied by a
 system driver.
 
-NOTE1: Binding and binding must be selected in Kconfig. It's under:
+NOTE1: Binding and unbinding must be selected in Kconfig. It's under:
 
 Device Drivers -> Character devices -> Support for binding and unbinding
 console drivers