Fixes #130, document mysql plugin better, README

README.md

@@ -133,11 +133,14 @@ path = [ "/opt", "/home" ]
 
 ## Supported Plugins
 
-Telegraf currently has support for collecting metrics from:
+**You can view usage instructions for each plugin by running**
+`telegraf -usage <pluginname>`
+
+Telegraf currently has support for collecting metrics from
 
 * disque
 * elasticsearch
-* exec (generic executable JSON-gathering plugin)
+* exec (generic JSON-emitting executable plugin)
 * haproxy
 * httpjson (generic JSON-emitting http service plugin)
 * kafka_consumer

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"]`