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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6d4df4a) 79.58% compared to head (916f75e) 79.28%.

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%)	⬇️

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[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.