event brokers documentation should say 'url' instead of 'host'

[cristianmtr]

Proposed changes:

• event brokers documentation should say 'url' instead of 'host'. Otherwise it fails saying there are two arguments being passed for host.

Status (please check what you already did):

• added some tests for the functionality
• updated the documentation
• updated the changelog (please check changelog for instructions)
• reformat files using black (please check Readme for instructions)

[CLAassistant]

All committers have signed the CLA.

[sara-tagger]

Thanks for submitting a pull request 🚀 @alwx will take a look at it as soon as possible ✨

[alwx]

Hey @cristianmtr! Thanks for your contribution!
Could you also add a changelog entry? A file named changelog/5811.docs.rst with a one-line description of what this task is about (there is a template in changelog directory).

[cristianmtr]

Hey @cristianmtr! Thanks for your contribution!
Could you also add a changelog entry? A file named changelog/5811.docs.rst with a one-line description of what this task is about (there is a template in changelog directory).

Done