Documentation omits usage of title and a11yRole

[mattdistefano]

It looks like https://fontawesome.com/v5.15/how-to-use/on-the-web/other-topics/accessibility#svg-semantic has been implemented in this project via the title Input, but is absent from the documentation (save for an example in the demo app). Same thing for the a11yRole input. Would be nice to see these documented better here since they're so key to the accessibility of the component.

[devoto13]

PR to improve documentation is welcome 😄

I think adding Accessibility article under Guides will be a good approach.