chore(mdns): Add more info to idf_component.yml

Fixing component manager warnings:
WARNING: A component description has not been provided in the manifest file. Please update your  file and include a brief description of the component.This will help other developers understand the purpose and functionality of your component. Documentation: https://***/projects/idf-component-manager/en/latest/guides/packaging_components.html#create-idf-component-yml
WARNING: A homepage URL has not been provided in the manifest file. Please update your  file and include the URL to the component's homepage. Documentation: https://***/projects/idf-component-manager/en/latest/guides/packaging_components.html#create-idf-component-yml

components/mdns/idf_component.yml

@@ -1,6 +1,9 @@
 version: "1.4.1"
-description: mDNS
-url: https://github.com/espressif/esp-protocols/tree/master/components/mdns
+description: "Multicast UDP service used to provide local network service and host discovery."
+url: "https://github.com/espressif/esp-protocols/tree/master/components/mdns"
+issues: "https://github.com/espressif/esp-protocols/issues"
+documentation: "https://docs.espressif.com/projects/esp-protocols/mdns/docs/latest/en/index.html"
+repository: "https://github.com/espressif/esp-protocols.git"
 dependencies:
   idf:
     version: ">=5.0"