Update auth.md

[daan-vdv]

In the last section the wrong file is referenced.
I changed it from auth.component.ts to todo.component.ts

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.78%. Comparing base (b4132f6) to head (0380a24).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #397   +/-   ##
=======================================
  Coverage   91.78%   91.78%           
=======================================
  Files          78       78           
  Lines       18660    18660           
  Branches     3233     3233           
=======================================
  Hits        17127    17127           
  Misses       1533     1533           

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[yoni-rapoport]

Thanks!