documenting pattern with by-move & by-ref bindings

[Amjad50]

This is to stabilize #68354.

To be documented in:

• The reference (Add move_ref_pattern docs reference#881)
• Rust by example (Add partial moves example for move_ref_pattern stabilization rust-by-example#1377)

@rustbot modify labels: T-doc, T-lang, A-patterns, F-move-ref-pattern

[rustbot]

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[Mark-Simulacrum]

Is there a reason for a separate issue tracking this beyond the tracking issue for the feature itself? It looks like upstream PRs have already been filed and maybe we could close this?

[Amjad50]

Thought if there is discussion specific to documentation should be here. But closing it will clean things maybe