Fix the values for the level field of the log processor (#171)

Signed-off-by: Mihai Todor <todormihai@gmail.com>

Author: mihaitodor

modules/components/pages/processors/log.adoc

@@ -63,7 +63,6 @@ Options:
 , `INFO`
 , `DEBUG`
 , `TRACE`
-, `ALL`
 .
 
 === `fields_mapping`