docs(ShellBar): update popover example (#4654)

Author: Lukas742

packages/main/src/webComponents/ShellBar/ShellBar.mdx

@@ -33,7 +33,7 @@ import ShellBarDomRef from './ShellBarDomRef.json';
 
 ### Recipe: How to open a popover on ShellBarItem click?
 
-To open a popover with the `ShellBarItem` you can use the `targetRef` property of the `onItemClick` event.
+To open a popover with the `ShellBarItem` you can use the `targetRef` property of the `onClick` event.
 
 ```jsx
 const ShellBarComponent = () => {
@@ -44,7 +44,7 @@ const ShellBarComponent = () => {
   return (
     <>
       <ShellBar>
-        <ShellBarItem onItemClick={handleShellBarItemClick} icon="add" text="add" />
+        <ShellBarItem onClick={handleShellBarItemClick} icon="add" text="add" />
       </ShellBar>
       <Popover ref={popoverRef}>Hello there!</Popover>
     </>