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 #1604, presumably by mistake.

Checklist

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b958bd7) 99.95% compared to head (700ded3) 99.95%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2340      +/-   ##
==========================================
- Coverage   99.95%   99.95%   -0.01%     
==========================================
  Files         107      107              
  Lines        2454     2449       -5     
  Branches      619      619              
==========================================
- Hits         2453     2448       -5     
  Partials        1        1              

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[WikiRik]

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