Fix typo in Scenario docstring

[penelopeysm]

Noticed this while looking through the Scenario source code (args having been removed in #470).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.25%. Comparing base (a94c9e9) to head (e19fda3).
Report is 1 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (a94c9e9) and HEAD (e19fda3). Click for more details.

HEAD has 30 uploads less than BASE

Flag	BASE (a94c9e9)	HEAD (e19fda3)
DI	37	10
DIT	8	5

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #773       +/-   ##
===========================================
- Coverage   97.88%   58.25%   -39.63%     
===========================================
  Files         128      123        -5     
  Lines        7460     7354      -106     
===========================================
- Hits         7302     4284     -3018     
- Misses        158     3070     +2912     

Flag	Coverage Δ
DI	46.27% <ø> (-52.68%)	⬇️
DIT	87.72% <100.00%> (-7.49%)	⬇️

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[gdalle]

thanks!