Configuration file improvements:

* Set default node_db to RocksDB from HyperlevelDB, to match gateway
  appliances and Ripple Labs server configurations.
* Set some rpc_startup options to reduce logging and save disk space.
* More sensible documentation regarding WebSocket SSL directives

Signed-off-by: The Doctor <drwho@virtadpt.net>

doc/rippled-example.cfg

@@ -793,10 +793,17 @@
 [node_size]
 medium
 
-# Note that HyperLevelDB is unavailable on Windows platforms
+# This is primary persistent datastore for rippled.  This includes transaction
+# metadata, account states, and ledger headers.  Helpful information can be
+# found here: https://ripple.com/wiki/NodeBackEnd
 [node_db]
-type=HyperLevelDB
-path=/var/lib/ripple/db/hyperldb
+type=RocksDB
+path=/var/lib/rippled/db/rocksdb
+open_files=2000
+filter_bits=12
+cache_mb=256
+file_size_mb=8
+file_size_mult=2
 
 [database_path]
 /var/lib/ripple/db
@@ -830,7 +837,15 @@ n9KF6RpvktjNs2MDBkmxpJbup4BKrKeMKDXPhaXkq7cKTwLmWkFr    RIP5
 [validation_quorum]
 3
 
-# Configure SSL for WebSockets.  Not enabled by default yet.
+# Turn down default logging to save disk space in the long run.
+# Valid values here are trace, debug, info, warning, error, and fatal
+[rpc_startup]
+{ "command": "log_level", "severity": "warning" }
+
+# Configure SSL for WebSockets.  Not enabled by default because not everybody
+# has an SSL cert on their server, but if you uncomment the following lines and
+# set the path to the SSL certificate and private key the WebSockets protocol
+# will be protected by SSL/TLS.
 #[websocket_secure]
 #1
 
@@ -840,6 +855,9 @@ n9KF6RpvktjNs2MDBkmxpJbup4BKrKeMKDXPhaXkq7cKTwLmWkFr    RIP5
 #[websocket_ssl_key]
 #/etc/ssl/private/server.key
 
+# Defaults to 0 ("no") so that you can use self-signed SSL certificates for
+# development, or internally.
 #[ssl_verify]
 #0
 
+