docs: update ref attribute example * docs: update ref attribute example ref -> useTemplateRef * fix: add import of useTemplateRef. https://github.com/vuejs/docs/pull/2991#discussion_r1742971516 (#1423)

[edimitchel]

resolves #1423 Cherry picked from https://github.com/vuejs/docs/commit/a681541956462672a0848e3fabfa5d0936d3d903

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