Better documentation on using eye gaze

[nuernber]

Describe the issue

The documentation on using eye tracking could be improved. My understanding is the eye gaze can interact with the scene via a special Pointer called an "InternalGazePointer", yet the documentation is lacking on utilizing eye gaze via Pointer APIs.

Feature area

• The Gaze documentation:
  • Could mention that it's possible to simply use a FocusHandler to receive eye gaze input
  • Mentions the following quote, yet doesn't explain what an "InternalGazePointer" is; searching the documentation turns up nothing

    Like other sources of input, the gaze provider interacts with objects in the scene through use of a pointer (see this document for information on pointers). In the case of the gaze provider, its pointer is implemented via InternalGazePointer and is not configured through a profile.

• The Input Simulation Service documentation isn't clear what keystrokes and/or mouse input cause eye gaze input to be simulated
• The Eye-supported target selection page is useful but does not appear in the table of contents
• The Pointers documentation does not explicitly mention eye gaze as a pointer (e.g., this figure doesn't show eye gaze except for HoloLens 1)
• The Controllers, Pointers, And Focus documentation does not mention eye gaze as a pointer type

Additional context

Possibly related to https://github.com/microsoft/MixedRealityToolkit-Unity/issues/5020 and https://github.com/microsoft/MixedRealityToolkit-Unity/issues/7758

[cre8ivepark]

@sostel for visibility

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