doc: highlight possible pathname expansion of knotc parameters

doc/operation.rst

@@ -73,9 +73,12 @@ configuration will be temporary (until the server is stopped).
 
 Most of the commands get an item name and value parameters. The item name is
 in the form of ``section[identifier].name``. If the item is multivalued,
-more values can be specified as individual (command line) arguments. Beware of
-the possibility of pathname expansion by the shell. For this reason, slashed
-square brackets or quoted parameters is advisable.
+more values can be specified as individual (command line) arguments.
+
+.. CAUTION::
+   Beware of the possibility of pathname expansion by the shell. For this reason,
+   it is advisable to slash square brackets or to quote command parameters if
+   not executed in the interactive mode.
 
 To get the list of configuration sections or to get the list of section items::