Fix(accessibility) fix sa11y accessibility issue for combobox (#5141)

* Cleaned code, added release notes

* Fixed the release number

* updated the release note

* Fixed aria-label attr

* Removed default aria label values

* updated the aria-label

* updated aria-label

* corrected name of prop according to listboxwrapper

---------

Co-authored-by: Manjunath Kalburgi <[email protected]>

Author: norvinder

ui/components/combobox/RELEASENOTES.md

@@ -9,6 +9,12 @@
 - Fixed by adding dynamic Ids for duplicate-id-aria issue
 - Fixed by adding unique Ids,aria-label for `aria-allowed-attr` wcag issue
 
+## 2.21.0
+
+## Added
+
+Added `aria-label` to meet accessibility requirements specifically for screen readers.
+
 ## 2.17.3
 
 ## Fixed

ui/components/combobox/base/example.jsx

@@ -447,6 +447,7 @@ export let states = [
           <ListboxWrapper
             id="listbox-id-3"
             className="slds-dropdown slds-dropdown_fluid"
+            ariaLabel="{{Placeholder for Dropdown Options}}"
           >
             <ListboxGroup
               aria-label="Group One"