Unless the example is from 2.79 and earlier it shouldn't take any or only minimal adjustments. There have been some API changes between versions since 2.81, but they usually wouldn't affect a lot of add-ons or are very easy to change.

All the API changes are also documented in the release notes [0] and the API docs allow to view the Python API for each version [1].

What change between versions caused you problems and what parts of the API docs were lacking?

[0] https://wiki.blender.org/wiki/Reference/Release_Notes [1] https://docs.blender.org/api/current/index.html