ShowCommandHelp (F1): improve the UX when multiple matching help topics are presented in a list

[mklement0]

Prerequisites

• Write a descriptive title.

Description of the new feature/enhancement

ShowCommandHelp (F1) also accepts "fuzzy" input, i.e. partial names of about_* topics and command names.

When multiple topics match, a static list is presented that the user cannot meaningfully interact with.
That is, there is no way to select the topic of interest in order to have it displayed.

Instead, the user must make a mental note of the specific command / topic name they're interested in, quit the list display, type the the specific command / topic name, and press F1 again.

A simple menu implementation that allows selecting the topic of interest for instant display would significantly improve the user experience.

Related:

• ShowCommandHelp (F1), with fuzzy input, doesn't consistently find all relevant topics, sometimes display single match in a list instead of opening the topic #3571

Proposed technical implementation details (optional)

No response