Add automatically documentation with phpDocument

[wppunk]

Is your feature request related to a problem? Please describe.

Automatically create documentation for WordPress hooks in PHP code. To generate it you can use https://github.com/phpDocumentor/phpDocumentor. To generate it inside the GH Actions:

- name: PhpDocumentor
        uses: gpupo/actions-phpDocumentor@1.0
        with:
          dir: './'