ipw2200: fix typo in kerneldoc

Fix a typo in kerneldoc for ipw2200.

Signed-off-by: Stefano Brivio <stefano.brivio@polimi.it>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ipw2200.c b/drivers/net/wireless/ipw2200.c
index 88062c1..003f73f8 100644
--- a/drivers/net/wireless/ipw2200.c
+++ b/drivers/net/wireless/ipw2200.c
@@ -4935,7 +4935,7 @@
 /**
  * Reclaim Tx queue entries no more used by NIC.
  *
- * When FW adwances 'R' index, all entries between old and
+ * When FW advances 'R' index, all entries between old and
  * new 'R' index need to be reclaimed. As result, some free space
  * forms. If there is enough free space (> low mark), wake Tx queue.
  *