Update Docs Examples

[bitkarrot]

Update docs to provide examples for : Sample code for lnurlw, user manager and userwallet.

• you can model the docs off the section that is already documented called "Sample code for lnurlp"
• The sample code is all in the test files.
• The test code need to properly formatted and confirmed that they work.

https://github.com/lightningames/pylnbits#updating-the-docs