update aria-label on expandable nav items

Author: kmcfaul

packages/react-core/src/components/Nav/examples/NavDocked.tsx

@@ -59,6 +59,7 @@ export const NavDocked: React.FunctionComponent = () => {
           icon={<RhUiFolderIcon />}
           isExpanded={isGroupExpanded}
           hasExpandableIcon
+          buttonProps={{ 'aria-label': 'Expandable Group 1' }}
         >
           <NavItem
             preventDefault

packages/react-core/src/demos/Compass/examples/CompassDockDemo.tsx

@@ -353,8 +353,7 @@ export const CompassDockDemo: React.FunctionComponent = () => {
                       isExpanded={isNavGroupExpanded}
                       icon={<RhUiFolderIcon />}
                       hasExpandableIcon={!isMobile}
-                      buttonProps={{ ref: navItem5Ref }}
-                      aria-label="Folder"
+                      buttonProps={{ ref: navItem5Ref, 'aria-label': 'Folder' }}
                     >
                       <NavItem
                         preventDefault

packages/react-core/src/demos/examples/Nav/NavDockedNav.tsx

@@ -370,8 +370,7 @@ export const NavDockedNav: React.FunctionComponent = () => {
                     isExpanded={isNavGroupExpanded}
                     icon={<RhUiFolderIcon />}
                     hasExpandableIcon={!isMobile}
-                    buttonProps={{ ref: navItem5Ref }}
-                    aria-label="Folder"
+                    buttonProps={{ ref: navItem5Ref, 'aria-label': 'Folder' }}
                   >
                     <NavItem
                       preventDefault