fix: refactor HTTP error codes for PUT /mentorship_relation/{request_id}/task/{task_id}/comment/{comment_id}

[RiddhiAthreya]

Description

Made changes to the HTTP error codes being returned according to what's discussed in the issue. I have also made the appropriate changes in the swagger documentation.

Fixes #634

Type of Change:

• Code
• Quality Assurance

Code/Quality Assurance Only

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Checklist:

• [ ] My PR follows the style guidelines of this project
• [ ] I have performed a self-review of my own code or materials
• [ ] Update Swagger documentation

Code/Quality Assurance Only

• [ ] My changes generate no new warnings
• [ ] New and existing unit tests pass locally with my changes

[vj-codes]

@RiddhiAthreya the linked issue is a first timers only issue, and you have already made your first contribution through #1126. Please check the issue labels while claiming next time :)

[devkapilbansal]

If you are unsure how this will be done, then feel free to ask :smile:

[devkapilbansal]

@RiddhiAthreya are you working on this?

[isabelcosta]

I will close this PR and unassign due to lack of response. Thank you for your contribution @RiddhiAthreya so far :)