doc: make spelling of behavior consistent
In the api docs there were some instances of behaviour and many more with behavior. I was asked as part of a review on a different PR which one to use and went with behavior to be consistent with the majority.
Not sure if we should mandate the US or english spelling but this makes the api docs consistent.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows [commit guidelines]
Affected core subsystem(s)
doc