🔧 Minor improvement to directive parsing code

[chrisjsewell]

This does not change any outward, user facing behaviour.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01 ⚠️

Comparison is base (aa1d225) 89.96% compared to head (910d455) 89.96%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #741      +/-   ##
==========================================
- Coverage   89.96%   89.96%   -0.01%     
==========================================
  Files          23       23              
  Lines        2970     2969       -1     
==========================================
- Hits         2672     2671       -1     
  Misses        298      298              

Flag	Coverage Δ
pytests	89.96% <100.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
myst_parser/mdit_to_docutils/base.py	92.65% <100.00%> (-0.03%)	⬇️
myst_parser/parsers/directives.py	96.42% <100.00%> (+0.06%)	⬆️

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