docs: minor updates in getting-started.md

[nautics889]

• (docs): missing comma in python snippet
• (docs): proofreading

---

• Tests added and passed if fixing a bug or adding a new feature.
• All code checks passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.87%. Comparing base (d1f0b36) to head (7706273).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1072   +/-   ##
=======================================
  Coverage   77.87%   77.87%           
=======================================
  Files         114      114           
  Lines        4457     4457           
=======================================
  Hits         3471     3471           
  Misses        986      986           

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