doc: fix quite a few typos within Documentation

Correct spelling typo in Documentations

Signed-off-by: Jiri Kosina <jkosina@suse.cz>

Documentation/video4linux/bttv/Cards

@@ -43,7 +43,7 @@ Very nice card if you only have satellite TV but several tuners connected
 to the card via composite.
 
 Many thanks to Matrix-Vision for giving us 2 cards for free which made
-Bt848a/Bt849 single crytal operation support possible!!!
+Bt848a/Bt849 single crystal operation support possible!!!