[Python] QHelp references old-ish python 2 documentation

[intrigus-lgtm]

I was looking at the py/modification-of-default-value query and noticed that it still refers to python 2 documentation.
A quick search reveals that there are more such references:
https://github.com/search?q=repo%3Agithub%2Fcodeql+%22python.org%2F2%22+language%3AXML&type=code&l=XML

While python 2.7 is still officially supported by CodeQL I think it would make sense to update those references to python 3.
But I of course also understand that this is probably a low priority issue :)

[jketema]

Hi @intrigus-lgtm,

Thanks for this. I'll let the CodeQL Python team know. I indeed expect this will have low priority though.