Fix argument name in DayNightComposite example document

[marty-sullivan]

This fixes an argument name in the example documentation for DayNightComposite. This wrong value in the example caused me a headache in figuring out since it did not throw an error but also did not do the expected behavior. I found in the API doc for DayNightComposite that need_alpha=False was supposed to be include_alpha=False.

[djhoese]

Nice catch. Yeah, sorry about that. I missed this changed when I asked the contributor to change the kwarg name.

[codecov]

Codecov Report

Merging #2514 (0384cd3) into main (1d37638) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2514   +/-   ##
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  Coverage   94.85%   94.85%           
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  Files         337      337           
  Lines       49635    49635           
=======================================
  Hits        47080    47080           
  Misses       2555     2555           

Flag	Coverage Δ
behaviourtests	4.41% <ø> (ø)
unittests	95.47% <ø> (ø)

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[coveralls]

Pull Request Test Coverage Report for Build 5317814646

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 95.42%

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Totals
Change from base Build 5317360458:	0.0%
Covered Lines:	47193
Relevant Lines:	49458

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💛 - Coveralls