Update documentation to cover new settings/fields

[LowellMontgomery]

The documentation has had some edits to improve the English and readability. This can be further improved on to also provide:

• updated screenshots of the settings (Lightroom's Plugin Manager panel),
• discussion of the new options provided there
• updated screenshots of the tagging dialog
• discussion of how the new features affect what you see there (e.g. ancestor paths tooltips seen when hovering over a keyword that already exists in the Lr Catalog).

[LowellMontgomery]

Add clear notice that this does NOT work for Windows users (I think, still? It would be nice to have a current confirmation since I've made a change or two which may have resolved that issue.)