I will say that as a Ruby on Rails dev, where many things have changed over time, there are quite a lot of highly voted StackOverflow posts where they go into detail about what the answer is on the date of posting, then someone comments "this is different in Rails 4.1+!" and the responder will revisit the answer and revise it to include applicable advice for whichever version you might be on.

This is not granted, but it happens a lot. Although if the docs are good, you should definitely expect to find good information about deprecation notices there, too! But it's not at all uncommon for conversations about code, on StackOverflow or wherever else, to include the footnotes about what is different and what version changed it.