feat: add documentation for keepAlive and keepAliveIntiialDelayMillis in client config

Author: Corey Van Woert

content/api/2-client.mdx

@@ -23,7 +23,9 @@ config = {
   query_timeout?: number, // number of milliseconds before a query call will timeout, default is no timeout
   application_name?: string, // The name of the application that created this Client instance
   connectionTimeoutMillis?: number, // number of milliseconds to wait for connection, default is no timeout
-  idle_in_transaction_session_timeout?: number // number of milliseconds before terminating any session with an open idle transaction, default is no timeout
+  idle_in_transaction_session_timeout?: number, // number of milliseconds before terminating any session with an open idle transaction, default is no timeout
+  keepAlive?: boolean, // enable keepAlive on the net.Socket, default is false
+  keepAliveInitialDelayMillis?: number, // number of milliseconds between last data packet received and first keepalive probe, default to zero (keeps last value set),
 }
 ```