Added logging-too-few-args message example (#6620)

Author: matusvalo

doc/data/messages/l/logging-too-few-args/bad.py

@@ -0,0 +1,7 @@
+import logging
+
+try:
+    function()
+except Exception as e:
+    logging.error('%s error occured: %s', e)  # [logging-too-few-args]
+    raise

doc/data/messages/l/logging-too-few-args/good.py

@@ -0,0 +1,7 @@
+import logging
+
+try:
+    function()
+except Exception as e:
+    logging.error('%s error occured: %s', type(e), e)
+    raise