[DOCS] No Reflection DataElements list, didn't know there were any.

[GaianHelmers]

Describe the issue

Alongside the Reflection system - Edit Context: https://docs.o3de.org/docs/user-guide/programming/components/reflection/edit-context/

There is no discernable list of actual Reflected elements available to match with the baseline logic.

I had not believed that there were actually any that didn't involve full custom window creation.

I just discovered in the O3DEWidgetGallery.exe that there are dozens of property window reflected elements to use.

However I had to dig even then to identify what the actual reflection was.

In O3DEEditor\Code\Framework\AzQtComponents\AzQtComponents\Gallery\ReflectedPropertyEditorPage.cpp there is the entire reflection set of commands present.

Expected experience

This should be completely exposed to documentation, shown piece by piece, explaining the attributes and things, and have this doc linked to EVERYWHERE that reflection is mentioned and described.

I will see what I can do over time, but needed to record this here for posterity.

[GaianHelmers]

Of note:

• Class Element contains "Group" functionality?
  • I guess it clusters until it hits a new group, or maybe card?
• UIElement is for data-free elements.
• DataElement is what we are normally used to.

[GaianHelmers]

I found that having a Label loose in a reflect, ends up at the top of the component when inherited.

Making it:
1 Inherited Label
2 Label
3 Inherited values
4 Values

I solved it by making non-editable groups, and putting the label and values inside it.