docs: Removing deprecated attribute from ContextualMenu's example

[sopranopillow]

This PR fixes the example CustomMenuList from ContextualMenu where filtering the menu list removes the link item. This is due to the menu item using the property name instead of text.

Current Behavior

Link disappears out of the list after filtering the list due to using the deprecated name instead of text.

New Behavior

Link will not disappear after being filtered.

Related Issue(s)

Fixes #21256

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