README: Improve the console logging section

Signed-off-by: Florian Hotze <[email protected]>

README.md

@@ -170,22 +170,23 @@ The library search will look in the path `automation/js/node_modules` in the use
 ### Console
 
 The JS Scripting binding supports the standard `console` object for logging.
-Script debug logging is enabled by default at the `INFO` level, but can be configured using the console logging commands.
+Script logging is enabled by default at the `INFO` level (messages from `console.debug` and `console.trace` won't be displayed), but can be configured using the [openHAB console](https://www.openhab.org/docs/administration/console.html):
 
 ```text
 log:set DEBUG org.openhab.automation.script
+log:set TRACE org.openhab.automation.script
+log:set DEFAULT org.openhab.automation.script
 ```
 
-The default logger name prefix is `org.openhab.automation.script`, this can be changed by assigning a new string to the `loggerName` property of the console.
-
-Please be aware that messages might not appear in the logs if the logger name does not start with `org.openhab`.
-This behaviour is due to [log4j2](https://logging.apache.org/log4j/2.x/) requiring definition for each logger prefix.
-
+The default logger name prefix is `org.openhab.automation.script`, this can be changed by assigning a new string to the `loggerName` property of the console:
 
 ```javascript
-console.loggerName = "org.openhab.custom"
+console.loggerName = 'org.openhab.custom';
 ```
 
+Please be aware that messages do not appear in the logs if the logger name does not start with `org.openhab`.
+This behaviour is due to [log4j2](https://logging.apache.org/log4j/2.x/) requiring a setting for each logger prefix in `$OPENHAB_USERDATA/etc/log4j2.xml` (on openHABian: `/srv/openhab-userdata/etc/log4j2.xml`).
+
 Supported logging functions include:
 
 - `console.log(obj1 [, obj2, ..., objN])`
@@ -200,6 +201,8 @@ The string representations of each of these objects are appended together in the
 
 See <https://developer.mozilla.org/en-US/docs/Web/API/console> for more information about console logging.
 
+Note: [openhab-js](https://github.com/openhab/openhab-js/) is logging to `org.openhab.automation.openhab-js`.
+
 ### Timers
 
 JS Scripting provides access to the global `setTimeout`, `setInterval`, `clearTimeout` and `clearInterval` methods specified in the [Web APIs](https://developer.mozilla.org/en-US/docs/Web/API).