fix: docstrong for to_script

[tmcclintock]

Closes #1261

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (7eba3a0) 93.74% compared to head (eacbc9c) 93.74%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1266   +/-   ##
=======================================
  Coverage   93.74%   93.74%           
=======================================
  Files          90       90           
  Lines        6711     6711           
=======================================
  Hits         6291     6291           
  Misses        420      420           

Impacted Files	Coverage Δ
pandera/api/pandas/container.py	99.28% <ø> (ø)

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[cosmicBboy]

thanks @tmcclintock !