Missing PHPDoc Tags

[volodymyrdovhan]

Hello,

I noticed that the plugin is missing PHPDoc tags in various places. Ensuring consistent and accurate PHPDoc comments throughout the codebase is important for clarity, maintainability, and better developer experience.

I recommend reviewing the codebase and adding or improving PHPDoc tags where necessary, following Moodle's PHP documentation standards: https://moodledev.io/general/development/policies/codingstyle#phpdoc-classes

[ikramagix]

Completed. Please refer to #11.