staging: rtlwifi: Fix "writen"->"written"

Trivial fix to spelling mistake in comment text.
Signed-off-by: Sabin Mihai Rapan <sabin.rapan@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtlwifi/rtl8822be/fw.c

@@ -82,7 +82,7 @@ static void _rtl8822be_fill_h2c_command(struct ieee80211_hw *hw, u8 element_id,
 	}
 
 	while (!bwrite_success) {
-		/* 2. Find the last BOX number which has been writen. */
+		/* 2. Find the last BOX number which has been written. */
 		boxnum = rtlhal->last_hmeboxnum;
 		switch (boxnum) {
 		case 0: