Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c
index 2ee6ceb..dbf74d0 100644
--- a/drivers/net/wireless/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/rt2x00/rt2800lib.c
@@ -1518,7 +1518,7 @@
 	if (rf->channel > 14) {
 		/*
 		 * When TX power is below 0, we should increase it by 7 to
-		 * make it a positive value (Minumum value is -7).
+		 * make it a positive value (Minimum value is -7).
 		 * However this means that values between 0 and 7 have
 		 * double meaning, and we should set a 7DBm boost flag.
 		 */