Fix example of environment variables in doc(en_US)

Signed-off-by: Mengyi Wang <mengyi.wang@canonical.com>

docs/en_US/operation/config/configuration_file.md

@@ -21,7 +21,7 @@ basic:
   # Whether to ignore case in SQL processing. Note that, the name of customized function by plugins are case-sensitive.
   ignoreCase: true
 ```
-for debug option in basic following env is valid `KUIPER_BASIC_DEBUG=true` and if used debug value will be set to true.
+for debug option in basic following env is valid `KUIPER__BASIC__DEBUG=true` and if used debug value will be set to true.
 
 Configuration **ignoreCase** is used to ignore case in SQL processing. By default, it's set to true to comply with standard SQL. In this case, data ingested can be case-insensitive. If the column names in the SQL, stream definition and the ingested data can be unified as a case-sensitive name, it is recommended to set to false to gain a better performance.
 
@@ -189,4 +189,4 @@ This section configures the portable plugin runtime.
 
 ## Ruleset Provision
 
-Support file based stream and rule provisioning on startup. Users can put a [ruleset](../restapi/ruleset.md#ruleset-format) file named `init.json` into `data` directory to initialize the ruleset. The ruleset will only be import on the first startup of eKuiper.
+Support file based stream and rule provisioning on startup. Users can put a [ruleset](../restapi/ruleset.md#ruleset-format) file named `init.json` into `data` directory to initialize the ruleset. The ruleset will only be import on the first startup of eKuiper.