Note that Synapse 1.74 queued a user dir rebuild (#15386)

* Note that Synapse 1.74 queued a user dir rebuild

* Changelog
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Note that Synapse 1.74 queued a rebuild of the user directory tables.

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@ -199,6 +199,17 @@ Docker images and Debian packages need nothing specific as they already
include or specify ICU as an explicit dependency.
## User directory rebuild
Synapse 1.74 queues a background update
[to rebuild the user directory](https://github.com/matrix-org/synapse/pull/14643),
in order to fix missing or erroneous entries.
When this update begins, the user directory will be cleared out and rebuilt from
scratch. User directory lookups will be incomplete until the rebuild completes.
Admins can monitor the rebuild's progress by using the
[Background update Admin API](usage/administration/admin_api/background_updates.md#status).
# Upgrading to v1.73.0
## Legacy Prometheus metric names have now been removed