doc: add 'logger_setting' parameter information to acrn-dm documentation
Add the '--logger_setting' parameter information to the 'acrn-dm' parameter
document.
@@ -317,3 +317,12 @@ Here are descriptions for each of these ``acrn-dm`` command line parameters:
running. It can only be powered off from inside the VM itself.
By default, this option is not enabled.
+
+ * - :kbd:`--logger_setting <console,level=4;disk,level=4;kmsg,level=3>`
+ - This option sets the level of logging that is used for each log channel.
+ The general format of this option is ``<log channel>,level=<log level>``.
+ Different log channels are separated by a semi-colon (``;``). The various
+ log channels available are: ``console``, ``disk`` and ``kmsg``. The log
+ level ranges from 1 (``error``) up to 5 (``debug``).
+
+ By default, the log severity level is set to 4 (``info``).
