DOC: fixup spacing in to_csv docstring (GH22475)

[jorisvandenbossche]

Follow-up on #22475

[pep8speaks]

Hello @jorisvandenbossche! Thanks for submitting the PR.

• There are no PEP8 issues in the file pandas/core/generic.py !

[codecov]

Codecov Report

Merging #22816 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #22816   +/-   ##
=======================================
  Coverage   92.18%   92.18%           
=======================================
  Files         169      169           
  Lines       50820    50820           
=======================================
  Hits        46850    46850           
  Misses       3970     3970

Flag	Coverage Δ
#multiple	90.6% <ø> (ø)	⬆️
#single	42.38% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/core/generic.py	96.67% <ø> (ø)	⬆️

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