Suggest keeping connections smaller than max connections of backend (#32)

Co-authored-by: Lev Kokotov <levkk@users.noreply.github.com>

Author: jaggederest

docs/configuration/pgdog.toml/databases.md

@@ -84,6 +84,9 @@ Default: **`0`**
 
 Overrides the [`default_pool_size`](general.md#default_pool_size) setting. All connection pools for this database will open at most this many connections to Postgres.
 
+!!! note "Recommendation"
+    We strongly recommend keeping this value well below the supported connections of the backend database(s) to allow connections for maintenance in high load scenarios.
+
 ### `statement_timeout`
 
 This setting configures the `statement_timeout` connection parameter on all connections to Postgres for this database.

docs/configuration/pgdog.toml/general.md

@@ -38,6 +38,9 @@ Default: **`0`** (current thread runtime)
 
 Default maximum number of server connections per database pool. The pooler will not open more than this many PostgreSQL database connections when serving clients.
 
+!!! note "Recommendation"
+    We strongly recommend keeping this value well below the supported connections of the backend database(s) to allow connections for maintenance in high load scenarios.
+
 Default: **`10`**
 
 ### `min_pool_size`