docs: fix use of deprecated functions in examples

[maelle]

Fix #825

@szhorvat This was semi-automatic: I automatically found calls to deprecated functions (only those from R7zzz-deprecate.R though) then replaced them manually.

@krlmlr Should this script stay in the package?

[maelle]

The test failure actually appears on main too. 🤔

[szhorvat]

Very nice that this could be partly automated!

I didn't realise that we marked neighborhood() as a deprecated alias of ego(). "Ego" is a very social science centric description of the concept and IMO should not be the default name in a general purpose network analysis package. Perhaps it would be better to keep both names as non-deprecated? What do you think @ntamas ?

For this PR, let's keep neighborhood() as is (not replace by ego()) and merge.

[szhorvat]

So just revert this single modification and then merge

[ntamas]

What do you think @ntamas ?

This was a decision made by Gábor a long time ago and I kinda disagree with it. I'd un-deprecate neighborhood() but keep ego() as a permanent alias.