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Add docs on upgrading from a very old version (#16951)

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Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>
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Add docs on upgrading from a very old version.

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docs/upgrade.md
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<!-- REPLACE_WITH_SCHEMA_VERSIONS -->
## Upgrading from a very old version
You need to read all of the upgrade notes for each version between your current
version and the latest so that you can update your dependencies, environment,
config files, etc. if necessary. But you do not need to perform an
upgrade to each individual version that was missed.
We do not have a list of which versions must be installed. Instead, we recommend
that you upgrade through each incompatible database schema version, which would
give you the ability to roll back the maximum number of versions should anything
go wrong. See [Rolling back to older versions](#rolling-back-to-older-versions)
above.
Additionally, new versions of Synapse will occasionally run database migrations
and background updates to update the database. Synapse will not start until
database migrations are complete. You should wait until background updates from
each upgrade are complete before moving on to the next upgrade, to avoid
stacking them up. You can monitor the currently running background updates with
[the Admin API](usage/administration/admin_api/background_updates.html#status).
# Upgrading to v1.100.0
## Minimum supported Rust version

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docs/usage/administration/admin_faq.md
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done
```
How do I upgrade from a very old version of Synapse to the latest?
---
See [this](../../upgrade.html#upgrading-from-a-very-old-version) section in the
upgrade docs.
Manually resetting passwords
---
Users can reset their password through their client. Alternatively, a server admin