staging: wlan-ng: Fix comment in prism2sta.c

This patch fix a spelling typo and modify a comment.
Signed-off-by: NMasanari Iida <standby24x7@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wlan-ng/prism2sta.c

@@ -199,7 +199,7 @@ static int prism2sta_close(wlandevice_t *wlandev)
 /*----------------------------------------------------------------
 * prism2sta_reset
 *
-* Not currently implented.
+* Currently not implemented.
 *
 * Arguments:
 *	wlandev		wlan device structure