Wrong documentation for properties that is just "System"

Problem/Motivation

There are many class properties with a description that is too simple. Exmaple:

/**
   * System.
   *
   * @var \Drupal\languagewire_translation_provider\Adapter\SystemInterface
   */
  private $system;

It should meaningful.

Steps to reproduce

Check the code. To locate all of these cases run:

grep "* System" * -r

Currently, 34 cases are detected.

Proposed resolution

Improve the documentation of those properties.