util/amdfwtool: Improve comment's grammar

Change-Id: I2daa57c1982346e48dbd91a94864baf2f11c2129
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reported-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38944
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

util/amdfwtool/amdfwtool.c

@@ -1439,7 +1439,7 @@ int main(int argc, char **argv)
 
 	integrate_firmwares(&ctx, amd_romsig, amd_fw_table);
 
-	ctx.current = ALIGN(ctx.current, 0x10000U); /* TODO: is necessary? */
+	ctx.current = ALIGN(ctx.current, 0x10000U); /* TODO: is it necessary? */
 
 	if (multi) {
 		/* Do 2nd PSP directory followed by 1st */