Improve custom admonitions documentation

[leodrivera]

As commented in #1345, it's the pull request for the correction of the raised points

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Codecov Report

Base: 91.37% // Head: 91.37% // No change to project coverage :thumbsup:

Coverage data is based on head (abc8ffe) compared to base (4f0944f). Patch has no changes to coverable lines.

:exclamation: Current head abc8ffe differs from pull request most recent head 3541039. Consider uploading reports for the commit 3541039 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1777   +/-   ##
=======================================
  Coverage   91.37%   91.37%           
=======================================
  Files           7        7           
  Lines         684      684           
=======================================
  Hits          625      625           
  Misses         59       59           

Flag	Coverage Δ
pytests	91.37% <ø> (ø)

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[leodrivera]

Hello @brownsarahm

Do you know who we can ping to approve this PR? Thanks in advance

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