docs(isIdentityCard): fix listed locales

[breadadams]

Removed the MZ locale from the list of allowed locales for isIdentityCard, since a validation method has never been added for said locale.

It was added in https://github.com/validatorjs/validator.js/pull/1604, presumably by mistake.

Checklist

• [x] PR contains only changes related; no stray files, etc.
• [x] README updated (where applicable)
• [ ] Tests written (where applicable)
• [x] References provided in PR (where applicable)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.95%. Comparing base (c25b98f) to head (700ded3). Report is 15 commits behind head on master.

:exclamation: Current head 700ded3 differs from pull request most recent head c4a144f

Please upload reports for the commit c4a144f to get more accurate results.

Additional details and impacted files

@@             Coverage Diff             @@
##            master    #2340      +/-   ##
===========================================
- Coverage   100.00%   99.95%   -0.05%     
===========================================
  Files          109      107       -2     
  Lines         2489     2449      -40     
  Branches       628      619       -9     
===========================================
- Hits          2489     2448      -41     
- Partials         0        1       +1     

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[WikiRik]

Don't mind the failure of codecov/project. That is not due to your PR