docs(SystemInformation): add list of possible DeviceFamily

[Odonno]

Issue: #1789

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build or CI related changes
[x] Documentation content changes
[ ] Sample app changes
[ ] Other... Please describe:

What is the current behavior?

Show basic Intellisense info on SystemInformation.DeviceFamily property.

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested code with current supported SDKs
• Docs have been added/updated which fit documentation template. (for bug fixes / features)
• Sample in sample app has been added / updated (for bug fixes / features)
  • Icon has been created (if new sample) following the Thumbnail Style Guide and templates
• Tests for the changes have been added (for bug fixes / features) (if applicable)

What is the new behavior?

Add list of possible values of SystemInformation.DeviceFamily property in XML docs so devs can see them when using the property.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

@XamlBrewer Not sure what to do about the link to Microsoft docs.

[XamlBrewer]

I would start the comments with "Common values include:" and end with "Prepare your code for other values."

[XamlBrewer]

I would start the comments with "Common values include:" and end with "Prepare your code for other values."

It has to be clear that the list is not complete.

[michael-hawker]

Should we add more after each point like common devices that use these types? i.e. HoloLens and Mixed Reality devices for holographic and Surface Hub for Team.

[Odonno]

Yes. We can add more information on the <description> node. The best option would be to add it on each item value but we need to be sure what to add on it. Like for Windows.Desktop, I suppose it englobes desktops, laptops and tablets.

[Odonno]

We can add it in a future PR if it is necessary.

[windowstoolkitbot]

This PR is linked to unclosed issues. Please check if one of these issues should be closed: #1789