bnx2x: correct a comment mistake in grammar

It is not right in grammar to spell "Its not". The right one is "It's
not".

And this line is also over 80 characters. So I broke it into two lines
as well in order to make that line not be more than 80 characters.

Signed-off-by: Hu Haowen <xianfengting221@163.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c

@@ -6874,7 +6874,8 @@ int bnx2x_link_update(struct link_params *params, struct link_vars *vars)
 			case PORT_HW_CFG_PHY_SELECTION_FIRST_PHY_PRIORITY:
 			/* In this option, the first PHY makes sure to pass the
 			 * traffic through itself only.
-			 * Its not clear how to reset the link on the second phy
+			 * It's not clear how to reset the link on the second
+			 * phy.
 			 */
 				active_external_phy = EXT_PHY1;
 				break;