docs: added docstring to swid_parser.py

[Mahhheshh]

closes #3712

This Pr Adds docstrings to cve_bin_tool/sbom_manager/swid_parser.py

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.28%. Comparing base (6d4df4a) to head (916f75e).
Report is 992 commits behind head on main.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3716      +/-   ##
==========================================
- Coverage   79.58%   79.28%   -0.31%     
==========================================
  Files         803      803              
  Lines       11974    11974              
  Branches     1603     1603              
==========================================
- Hits         9529     9493      -36     
- Misses       1990     2043      +53     
+ Partials      455      438      -17     

Flag	Coverage Δ
longtests	73.91% <ø> (-0.04%)	⬇️
win-longtests	77.29% <ø> (-0.31%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[terriko]

Thanks! and that's two docstrings issues merged for you, so please don't pick up any more docstring issues (leave those for other people trying to get their first commits!) but do feel free to work on anything else in the issues list.