Fix typo in "docs/usage/advanced-hooks.yml"

[shagabutdinov]

What:

Fix a small typo in the documentation in file docs/usage/advanced-hooks.yml.

Why:

Because typos are annoying

How:

Via GitHub UI 😄

Checklist:

• Documentation updated
• Tests
• Ready to be merged
  
• Added myself to contributors table
  

[codecov]

Codecov Report

Merging #325 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #325   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           4      4           
  Lines          95     95           
  Branches       15     15           
=====================================
  Hits           95     95

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[mpeyper]

Thanks :)