Enhance default config (#2005, #2006)

Co-authored-by: Luck <git@lucko.me>

velocity/src/main/resources/config.yml

@@ -123,6 +123,15 @@ data:
     connection-timeout: 5000 # 5 seconds
 
     # This setting allows you to define extra properties for connections.
+    #
+    # By default, the following options are set to enable utf8 encoding. (you may need to remove
+    # these if you are using PostgreSQL)
+    #   useUnicode: true
+    #   characterEncoding: utf8
+    #
+    # You can also use this section to disable SSL connections, by setting:
+    #   useSSL: false
+    #   verifyServerCertificate: false
     properties:
       useUnicode: true
       characterEncoding: utf8