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Please remove trailing whitespace in the PR to fix CI.

@rhettinger I think this can be closed with #11946 merged.

I now build on #11946 and included a reference to clarify what ^ does.
Clarifying what ^ does was what was incorrect before #11946 , removing it fixes the error but does not help the reader understand this special character the first time that it is used.

I don't think introducing a forward reference to the section on ^ is useful here since it is only talking about character classes, in my opinion leaving it at Raymond's change is appropriate.

Hi @LouisMichael thank you for you pull request, that's appreciated.

Sadly, @rhettinger did #11946 in the meantime, and merged it. so I will close this one.

Sorry for this one.