* doc fix

* rust sql insert example

* rust schemaless examples

* rust stmt examples

* rust query example

* remove go async

* format code

improve the format

* 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

* code review

* python insert example

* python stmt example

* python query example

* python async exmaple

* python json example

* java json example

* java insert example

* sql upper case

* java stmt example

* java stmt exmaple

* insert - create files

* refine slug

* create sample files for query

* add note

* add sample code

* add sample code

* add example

* add connect examples

* adjust doc structure

* adjust doc structure

* modify sample code path