Update permitted ARIA state or property for combobox role

[shunguoy]

<< Describe the changes >>
Per the latest ARIA spec, change the permitted ARIA state or property for "combobox" role from "aria-controls" to "aria-expanded" in the Pass example 6, 7 & 8.

Closes issue(s):

• closes [5c01ea] ARIA state or property is permitted - Passed Example 6-7-8-10-12 improvement #2311

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[WilcoFiers]

Minor nitpick. I also think we should add something to the background noting the change in ARIA 1.3.

[shunguoy]

@WilcoFiers Added a reference to ARIA 1.3 in the background section, and other changes you mentioned. ALso fixed some merge conflicts.

sorted