fix state file documentation

doc/state.md

-title: The 66 Suite: 66-instate
+title: The 66 Suite: state
 author: Eric Vidal <eric@obarun.org>
 
 [66](index.html)
@@ -7,7 +7,7 @@ author: Eric Vidal <eric@obarun.org>
 
 [obarun.org](https://web.obarun.org)
 
-# 66-instate
+# state
 
 This command displays the contents of the service's *state* file.
 
@@ -17,20 +17,15 @@ This command displays the contents of the service's *state* file.
 state [ -h ] service
 ```
 
-66-instate displays the contents of the service's *state* file. This file are used internally by the *66* tools to know runtime *service* information. This tool is purely a debug tool used by developers.
-
-## Exit codes
-
-- *0* success
-- *100* wrong usage
-- *111* system call failed
+This command displays the contents of the service's *state* file. This file are used internally by the `66` program to know runtime *service* information. This command is purely a debug command used by system administrator or developers.
 
 ## Options
 
 - **-h**: prints this help;
 
-- **-z**: use color.
-
-- **-t** *tree*: only searches the service at the specified *tree*, when the same service may be enabled in more trees.
+## Usage example
 
-- **-l**: displays the contents of the associated logger's *state* file if any.
+Display state of service `foo`
+```
+66 state foo
+```