docs: add strict wildcard flags in README.md

Author: Adel Assakaf

README.md

@@ -494,8 +494,8 @@ func main() {
 - As default, `dnsx` checks for **A** record.
 - As default `dnsx` uses Google, Cloudflare, Quad9 [resolver](https://github.com/projectdiscovery/dnsx/blob/43af78839e237ea8cbafe571df1ab0d6cbe7f445/libs/dnsx/dnsx.go#L31).
 - Custom resolver list can be loaded using the `r` flag.
-- Domain name (`wd`) input is mandatory for wildcard elimination.
-- DNS record flag can not be used when using wildcard filtering.
+- Domain name (`wd`) input is required for wildcard filtering with `-wd`. The `-sw` flag provides automatic wildcard detection without needing `-wd`.
+- DNS record flag can not be used when using wildcard filtering with `-wd`.
 - DNS resolution (`l`) and DNS brute-forcing (`w`) can't be used together.
 - VPN operators tend to filter high DNS/UDP traffic, therefore the tool might experience packets loss (eg. [Mullvad VPN](https://github.com/projectdiscovery/dnsx/issues/221)). Check [this potential solution](./MULLVAD.md).