ERC20Permit Doc

[immrsd]

Adds documentation for ERC20Permit #1103

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.89%. Comparing base (7ac655c) to head (3977d41).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1183   +/-   ##
=======================================
  Coverage   91.89%   91.89%           
=======================================
  Files          47       47           
  Lines        1197     1197           
=======================================
  Hits         1100     1100           
  Misses         97       97           

Files with missing lines	Coverage Δ
packages/token/src/erc20/erc20.cairo	96.55% <ø> (ø)
packages/utils/src/cryptography/snip12.cairo	83.33% <ø> (ø)

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[ericnordelo]

Looking great! Left two small format suggestions.

[ericnordelo]

LGTM!