How to check codeigniter version in documentation

@pikato

1. An Index of available commands in the documentation.

What do you mean by commands?
This?
https://codeigniter4.github.io/CodeIgnit...g-commands

2. Example codes

Do you mean you want more example codes in the User Guide?

3. Discussion on APIs

What do you mean?

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper