MSC4368: Combine definitions of M_RESOURCE_LIMIT_EXCEEDED error code and m.server_notice.usage_limit_reached server notice type#4368

hughns wants to merge 2 commits intomainmatrix-org/matrix-spec-proposals:mainfrom

hughns/resource-limit-exceeded-extra-fieldsmatrix-org/matrix-spec-proposals:hughns/resource-limit-exceeded-extra-fieldsCopy head branch name to clipboard