docs: add new functions for gitboook

Author: hatamiarash7

docs/SUMMARY.md

@@ -11,8 +11,10 @@
 ## Functions
 
 * [Extract Domain](functions/extract-domain.md)
+* [Extract Extension](functions/extract-extension.md)
 * [Extract Subdomain](functions/extract-subdomain.md)
 * [Extract Path](functions/extract-path.md)
+* [Extract Port](functions/extract-port.md)
 * [Extract Host](functions/extract-host.md)
 * [Extract Schema](functions/extract-schema.md)
 * [Extract Query](functions/extract-query.md)

docs/functions/extract_extension.md renamed to docs/functions/extract-extension.md

@@ -62,6 +62,7 @@ The build process is long and resource-intensive. Use tools like [Ninja](https:/
 ```bash
 GEN=ninja make
 ```
+
 {% endhint %}
 
 #### Tests <a href="#tests" id="tests"></a>