Document the behaviour of int("NaN")

[choroba]

There are still people surprised by it, e.g. https://www.perlmonks.org/?node_id=11159579

[haarg]

The change here seems to be trying to document two issues at the same time.

It's documenting that "Info" gets numified into inf, but this has little to do with int. It's also documenting that int(inf) still produces an inf. That seems like the relevant thing to be focusing on here. I feel like using int("Info") rather than int("Inf") makes the docs more confusing.

[choroba]

Ok, removed the "o" in "Info". Another fixup.

[khwilliamson]

All that is left is s/Info/Inf/ That is fine with me, but I think the commit message should reflect the actual change

[choroba]

Commit message updated, commits squashed, and rebased on blead.

[jkeenan]

@haarg, @khwilliamson ... is this good to merge now?