docs: include references for gathering the correct codecov token

[zimeg]

Summary

This PR links to the @codecov reference that can be followed to gather a human-generated API token. Sending this as a change request because it took me more than a minute or so to discover 🔍

Notes

Reference: https://docs.codecov.com/reference/overview

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.48%. Comparing base (4f0a62d) to head (f11fd17).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #50   +/-   ##
=======================================
  Coverage   95.48%   95.48%           
=======================================
  Files           6        6           
  Lines         332      332           
=======================================
  Hits          317      317           
  Misses         15       15           

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[mwbrooks]

You're a saint 😇 Thanks for sharing the link and saving everyone else the time to look it up!

[zimeg]

@mwbrooks I am here to follow great learnings 🙏 Thanks for the review! And always happy to share links of interest 🔗 😉