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Add upgrade notes about disk space for events migration (#10314)

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CHANGES.md
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Synapse 1.38.0 (**UNRELEASED**)
===============================
This release includes a database schema update which could result in elevated disk usage. See the [upgrade notes](https://matrix-org.github.io/synapse/develop/upgrade.md#upgrading-to-v1380) for more information.
Synapse 1.37.1 (2021-06-30)
===========================

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Fix a long-standing bug where Synapse would return errors after 2<sup>31</sup> events were handled by the server.

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wget https://packages.matrix.org/debian/pool/main/m/matrix-synapse-py3/matrix-synapse-py3_1.3.0+stretch1_amd64.deb
dpkg -i matrix-synapse-py3_1.3.0+stretch1_amd64.deb
```
# Upgrading to v1.38.0
## Re-indexing of `events` table on Postgres databases
This release includes a database schema update which requires re-indexing one of
the larger tables in the database, `events`. This could result in increased
disk I/O for several hours or days after upgrading while the migration
completes. Furthermore, because we have to keep the old indexes until the new
indexes are ready, it could result in a significant, temporary, increase in
disk space.
To get a rough idea of the disk space required, check the current size of one
of the indexes. For example, from a `psql` shell, run the following sql:
```sql
SELECT pg_size_pretty(pg_relation_size('events_order_room'));
```
We need to rebuild **four** indexes, so you will need to multiply this result
by four to give an estimate of the disk space required. For example, on one
particular server:
```
synapse=# select pg_size_pretty(pg_relation_size('events_order_room'));
pg_size_pretty
----------------
288 MB
(1 row)
```
On this server, it would be wise to ensure that at least 1152MB are free.
The additional disk space will be freed once the migration completes.
SQLite databases are unaffected by this change.
# Upgrading to v1.37.0
## Deprecation of the current spam checker interface