Exemplify events. methods, types, and properties for each storage space

### MDN URL

https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/storage

### What specific section or headline is this issue about?

_No response_

### What information was incorrect, unhelpful, or incomplete?

Events. methods, types, and properties all generalized and not documented specifically for each storage space.

### What did you expect to see?

Events. methods, types, and properties documented for each storage space for clarity and also to enable examples to be storage space specific.

### Do you have any supporting links, references, or citations?

See discussion in https://bugzilla.mozilla.org/show_bug.cgi?id=1908925#c17

### Do you have anything more you want to share?

_No response_