tty: Fix typo in LEGACY_TIOCSTI Kconfig description

Fix typo in LEGACY_TIOCSTI Kconfig description

There is a stray ' in the description before the Y. It appears this was
meant as a quote for the 'Y'. However, it is more common to use
unquoted Y in Kconfig descriptions.

Signed-off-by: Hanno Böck <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/Kconfig

···
 	  a dangerous legacy operation, and can be disabled on most
 	  systems.
 
-	  Say 'Y here only if you have confirmed that your system's
+	  Say Y here only if you have confirmed that your system's
 	  userspace depends on this functionality to continue operating
 	  normally.