Add more docs in vector search

[kartik4949]

Description

Extends doc string in vector search module

Related Issues

Checklist

• Is this code covered by new or existing unit tests or integration tests?
• Did you run make unit-testing and make integration-testing successfully?
• Do new classes, functions, methods and parameters all have docstrings?
• Were existing docstrings updated, if necessary?
• Was external documentation updated, if necessary?

Additional Notes or Comments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (34830a7) 80.33% compared to head (98256c4) 80.59%.
Report is 1336 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1608      +/-   ##
==========================================
+ Coverage   80.33%   80.59%   +0.25%     
==========================================
  Files          95      111      +16     
  Lines        6602     7884    +1282     
==========================================
+ Hits         5304     6354    +1050     
- Misses       1298     1530     +232     

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