Enhance documentation: add usage references / examples

[kaplanlior]

For some of the plugins we marked usage examples as "Add reference".

This is a good entry level task for users who want to contribute.
Tagging as "good first issue".

[nirmo]

I can take this one

[baruchiro]

@nirmo I will not assign you on multiple issues in parallel, hope you will understand 😄.

Thank you a lot, you're helping me!

[nirmo]

Np, documentation can wait ;)