docs(docs/config.md): Fix typo in cz.yaml section

[sadikkuzu]

Description

Fix typo in cz.yaml section

• From proyects to projects.

Checklist

• Add test cases to all the changes you introduce
• Run ./script/format and ./script/test locally to ensure this change passes linter check and test
• Test the changes on the local machine manually
• Update the documentation for the changes

Expected behavior

https://commitizen-tools.github.io/commitizen/config/#czyaml-or-czyaml will have fixed sentence.

Steps to Test This Pull Request

Additional context

[codecov]

Codecov Report

Merging #506 (8dcf97f) into master (8c2a6f4) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #506   +/-   ##
=======================================
  Coverage   97.85%   97.85%           
=======================================
  Files          39       39           
  Lines        1539     1539           
=======================================
  Hits         1506     1506           
  Misses         33       33           

Flag	Coverage Δ
unittests	97.85% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
commitizen/__version__.py	100.00% <100.00%> (ø)

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