Shortcut key help should be explicit

[Nicola Heald]

The help when you hold the super key needs to be explicit and not assume knowledge of what lenses do.

"Opens the Dash Files Lens" is only helpful if you know what the files lens is and does. "Search files on this computer" lets me know it's only going to do a local search, and not include results from online sources like my google drive, etc.

I'm introducing a few new users to unity, their first question on seeing that help was, "what's a lens?"

[Stephen M. Webb (bregma)]

Marking this as incomplete pending feedback from ayatan-design.

Rewording the key descriptions to be more function-oriented instead of implementation-oriented would be a significant improvement.