* doc fix

* rust sql insert example

* rust schemaless examples

* rust stmt examples

* rust query example

* remove go async

* format code

* go sql insert example

* fix go doc bug

* adjust cluster part; change mysql to sql

* add go connect example using af

* go stmt example

* go influxdb line example

* go telnet line insert example

* reduce sample data

* go json insert example

* go query example