Clarification: Should retrieving a single event return an array

Currently the spec for retrieving a single event [GET /_matrix/federation/v1/event/{eventId}](https://matrix.org/docs/spec/server_server/r0.1.4#get-matrix-federation-v1-event-eventid) has a response defined as:

Parameter | Type | Description
-- | -- | --
.. | .. | ..
pdus | [PDU] | **Required.** A single PDU. Note that events have a different format depending on the room version - check the room version specification for precise event formats.

The comment and the response type seem to disagree. Should this actually return a `PDU` instead of a `[PDU]`?

Read the GET /_matrix/federation/v1/event/{eventId} definition and compare the declared pdus response type with its description of a single PDU. Check the referenced room-version event format, then align the response type and explanatory text so the specification resolves the question consistently.

Written by the indexing model from the issue text.