Update index.md

[markus-leben]

Changed AllIdentifiers description to clarify it contains tokens

[ZeldaZach]

Thanks for helping to keep MTGJSON up to date :)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (acfc7b4) to head (64ae8c0).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #698   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           69        69           
  Branches        27        27           
=========================================
  Hits            69        69           

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