MSC3582: Remove m.room.message.feedback (#3582)

* proposal to remove m.room.message.feedback

* use MSC number

proposals/3582-remove-room-feedback.md

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+# MSC3582: Remove m.room.message.feedback
+
+The spec defines an
+[`m.room.message.feedback`](https://spec.matrix.org/unstable/client-server-api/#mroommessagefeedback)
+event that
+
+- is obsoleted by read receipts,
+- is not used by anyone anywhere, and
+- is discouraged by the spec.
+
+See also: https://github.com/matrix-org/matrix-doc/issues/3318
+
+## Proposal
+
+The `m.room.message.feedback` event should be removed from the spec.