Remove surrounding whitespace from docstrings

[artofhuman]

Closes #599

I've used ruff with autofix options and rule D210.

ruff check --select D210 . --fix

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4bce007) 98.31% compared to head (debe1cc) 98.31%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #633   +/-   ##
=======================================
  Coverage   98.31%   98.31%           
=======================================
  Files          13       13           
  Lines        2557     2557           
=======================================
  Hits         2514     2514           
  Misses         43       43           

Files Changed	Coverage Δ
transitions/core.py	100.00% <ø> (ø)
transitions/extensions/asyncio.py	97.77% <ø> (ø)
transitions/extensions/diagrams.py	98.11% <ø> (ø)
transitions/extensions/diagrams_base.py	97.59% <ø> (ø)
transitions/extensions/diagrams_graphviz.py	96.75% <ø> (ø)
transitions/extensions/diagrams_pygraphviz.py	99.45% <ø> (ø)
transitions/extensions/factory.py	94.73% <ø> (ø)
transitions/extensions/locking.py	100.00% <ø> (ø)
transitions/extensions/markup.py	99.34% <ø> (ø)
transitions/extensions/nesting.py	99.29% <ø> (ø)
... and 2 more

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[aleneum]

Hi @artofhuman,

thanks a lot!