CodingStyle: fix a minor typo

There was a minor typo in the CodingStyle document where the word 'section'
had been spelled as 'secton'.
Signed-off-by: NRaymond L. Rivera <ray.l.rivera@gmail.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

Documentation/CodingStyle

@@ -675,7 +675,7 @@ the ones already enabled by DEBUG.
 Many subsystems have Kconfig debug options to turn on -DDEBUG in the
 corresponding Makefile; in other cases specific files #define DEBUG.  And
 when a debug message should be unconditionally printed, such as if it is
-already inside a debug-related #ifdef secton, printk(KERN_DEBUG ...) can be
+already inside a debug-related #ifdef section, printk(KERN_DEBUG ...) can be
 used.