rt2x00: Comment spellchecking

Fix a bunch of spelling errors in the rt2x00 drivers

Signed-off-by: Luis Correia <luis.f.correia@gmail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00reg.h

@@ -176,8 +176,8 @@ struct rt2x00_field32 {
 #define is_valid_mask(x)	is_power_of_two(1LU + (x) + low_bit_mask(x))
 
 /*
- * Macro's to find first set bit in a variable.
- * These macro's behaves the same as the __ffs() function with
+ * Macros to find first set bit in a variable.
+ * These macros behave the same as the __ffs() functions but
  * the most important difference that this is done during
  * compile-time rather then run-time.
  */