docs: Added comments for custom markdown rules in .markdowndlint-cli2…

[akhilmohnn]

## Because This PR aims to improve clarity within the .markdowndlint-cli2.jsonc file by adding comments that explain the purpose of each custom markdown rule used in the project. This helps contributors and maintainers understand the specific rules being enforced.

## This PR

• Added detailed comments for each custom rule listed in the customRules section.
• Improved documentation within the configuration file to make it more user-friendly.

## Issue This PR does not close any specific issue but contributes to the overall quality and maintainability of the project.

## Additional Information No additional changes were made beyond adding comments.

## Pull Request Requirements

• [x] I have thoroughly read and understand The Odin Project curriculum contributing guide.
• [x] The title of this PR follows the location of change: brief description of change format.
• [x] The Because section summarizes the reason for this PR.
• [x] The This PR section has a bullet point list describing the changes in this PR.
• [x] No specific issue is addressed by this PR.
• [x] Changes were previewed to ensure proper formatting.
• [x] Changes follow the Layout Style Guide.

Allow edits by maintainers.

[akhilmohnn]

Thank you for the feedback! I’ve updated the .markdowndlint-cli2.jsonc file to include a single general comment for the custom rules array, as suggested. Let me know if there’s anything else I can adjust.

[MaoShizhong]

Thank you for the feedback! I’ve updated the .markdowndlint-cli2.jsonc file to include a single general comment for the custom rules array, as suggested. Let me know if there’s anything else I can adjust.

Looks like you forgot to push the commits? This branch hasn't been updated with any changes.

[MaoShizhong]

Superceded by #29018