Documentation/video4linux/si476x.txt fix a typo

Corrected the word Adjascent to Adjacent.

Signed-off-by: Stefan Huber <steffhip@googlemail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

Documentation/video4linux/si476x.txt

@@ -166,7 +166,7 @@ The drivers exposes following files:
   --------------------------------------------------------------------
   0x21		| dev		| Frequency deviation
   --------------------------------------------------------------------
-  0x24		| assi		| Adjascent channel SSI
+  0x24		| assi		| Adjacent channel SSI
   --------------------------------------------------------------------
   0x25		| usn		| Ultrasonic noise indicator
   --------------------------------------------------------------------