docs: improve notifier configuration

[akramer-zibra]

This commit changes some misleading and vague formulations about internal apprise tool/package and supported services. Also fixes some typos and text format in the docs text. See: #1061

[Arksine]

It is certainly unfortunate that you were confused by the existing notifier documentation. I disagree with your characterization that the docs are "misleading". The notifier component and its associated documentation have been available for several years and this is the first report I have received regarding said docs. Vague? I suppose that is in the eye of the beholder. The docs didn't explicitly describe Apprise as a "library", however they linked to the library. All that said, I'm not opposed to improving and clarifying the documentation.

Upon reviewing your PR, I think we can be more explicit. It does note that Moonraker "uses" the "tool/package" locally, but it doesn't differentiate between the tool and the API Gateway. To clear up any confusion I have pushed a few commits that should make the following absolutely clear:

• Moonraker leverages the Apprise library
• The library is installed as a part of Moonraker
• The version of the library determines what service notifications are available

I made some additional clarifications and added a link to the official apprise documentation in place of the Wiki. I also took the opportunity to bump Apprise to 1.9.8.

[akramer-zibra]

Sharing is caring. I appreciate your work. Thank you very much. Case closed