fix: enhance get article by id and add params for c# docs

[RaphAlemoh]

Description

This pull request implements enhance the get article by ID and add a param for the response alignment to c#. This endpoint uses the get method. ​

Related Issue (Link to Github issue)

Feature #867 ​ Endpoints GET /api/v1/help-center/topics/id

Enable retrieval of article by ID

How Has This Been Tested?

• Successful response for valid article id
• invalid article id
• Appropriate status code

Screenshots (if appropriate - Postman, etc):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change) ​

  Checklist:

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.