Fixes #130, document mysql plugin better, README

plugins/mysql/mysql.go

@@ -16,7 +16,9 @@ type Mysql struct {
 var sampleConfig = `
 # specify servers via a url matching:
 #  [username[:password]@][protocol[(address)]]/[?tls=[true|false|skip-verify]]
-#  e.g. root:root@http://10.0.0.18/?tls=false
+#  e.g.
+#    root:root@http://10.0.0.18/?tls=false
+#    root:passwd@tcp(127.0.0.1:3036)/
 #
 # If no servers are specified, then localhost is used as the host.
 servers = ["localhost"]`

plugins/postgresql/postgresql.go

@@ -25,11 +25,11 @@ var sampleConfig = `
 #   postgres://[pqgotest[:password]]@localhost?sslmode=[disable|verify-ca|verify-full]
 # or a simple string:
 #   host=localhost user=pqotest password=... sslmode=...
-# 
+#
 # All connection parameters are optional. By default, the host is localhost
 # and the user is the currently running user. For localhost, we default
 # to sslmode=disable as well.
-# 
+#
 
 address = "sslmode=disable"