I think there is a difference. Not so much because of political correctness, but because it is an inherently political joke.

Secondly, the joke is extremely US centric, and might make no sense to somebody now familiar on the US stance on abortion and its political impact.

I think it's misplaced for those reasons, and I am left-leaning and pro-choice. So while i agree with the political viewpoint in the joke, i don't think it should be in the software documentation.

That being said, i think easter eggs are fine, but this feels misplaced to me.