docs(dropdownmenu): add @deprecated tag to comment

[masoudmanson]

Summary

DropdownMenu

prefix the deprecation comment with a @deprecated tag so we get the strikethrough text to encourage users to migrate to the new type.

/**
 * @deprecated
 * (masoudmanson): We've replaced DefaultDropdownMenuOption with DefaultAutocompleteOption
 * as the preferred choice. However, for backward compatibility, we've exported this line to
 * prevent potential TypeScript type issues for product teams using previous versions.
 */
export type DefaultDropdownMenuOption = DefaultAutocompleteOption;

[tihuan]

Hurray thank you! I forgot about this too 😆 Thanks for the quick followup PR!