Tweak wording of database recommendation in INSTALL.md (#10057)

* Tweak wording of database recommendation in INSTALL.md

Signed-off-by: Aaron Raimist <aaron@raim.ist>

INSTALL.md

@@ -399,11 +399,9 @@ Once you have installed synapse as above, you will need to configure it.
 
 ### Using PostgreSQL
 
-By default Synapse uses [SQLite](https://sqlite.org/) and in doing so trades performance for convenience.
-SQLite is only recommended in Synapse for testing purposes or for servers with
-very light workloads.
-
-Almost all installations should opt to use [PostgreSQL](https://www.postgresql.org). Advantages include:
+By default Synapse uses an [SQLite](https://sqlite.org/) database and in doing so trades
+performance for convenience. Almost all installations should opt to use [PostgreSQL](https://www.postgresql.org)
+instead. Advantages include:
 
 - significant performance improvements due to the superior threading and
   caching model, smarter query optimiser
@@ -412,6 +410,10 @@ Almost all installations should opt to use [PostgreSQL](https://www.postgresql.o
 For information on how to install and use PostgreSQL in Synapse, please see
 [docs/postgres.md](docs/postgres.md)
 
+SQLite is only acceptable for testing purposes. SQLite should not be used in
+a production server. Synapse will perform poorly when using
+SQLite, especially when participating in large rooms.
+
 ### TLS certificates
 
 The default configuration exposes a single HTTP port on the local

changelog.d/10057.doc

+Tweak wording of database recommendation in `INSTALL.md`. Contributed by @aaronraimist.
\ No newline at end of file