Simplify info string strip

[hukkin]

token.info is always a str so we can do this

[codecov]

Codecov Report

Merging #365 (6678b2d) into master (fb8c8fd) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #365   +/-   ##
=======================================
  Coverage   90.38%   90.38%           
=======================================
  Files          14       14           
  Lines        1789     1789           
=======================================
  Hits         1617     1617           
  Misses        172      172           

Flag	Coverage Δ
pytests	90.38% <100.00%> (ø)

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Impacted Files	Coverage Δ
myst_parser/docutils_renderer.py	92.35% <100.00%> (ø)

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