GET /initialSync's response mentions a limit parameter which is not documented for the request

Link to problem area: https://spec.matrix.org/v1.13/client-server-api/#get_matrixclientv3roomsroomidinitialsync_response-200_paginationchunk

Issue

The definition of the chunk property of PaginationChunk in the response says this:

This array will consist of at most limit elements.

But the limit parameter is not documented in the Request definition.

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