attempt to improve the error message, added a references to the @help command

LogBot/logbot.py

@@ -288,7 +288,7 @@ class Logbot(Bot):
                 )
                 reply = f"I'm switching the stylesheet of this log to: { stylesheet }."
             except:
-                reply = f"The stylesheet '{ stylesheet }' is unknown to me. Check @help to see the available stylesheets."
+                reply = f"The stylesheet '{ stylesheet }' is unknown to me. Check logbot @help to see the available stylesheets."
 
         # Response to @font
         elif "@font" in message.text:
@@ -314,7 +314,7 @@ class Logbot(Bot):
                     reply = f"The font '{ font }' is unknown to me. Check @help to see the available fonts."
 
         else:
-            reply = "Hmm ... not sure what you want to do?"
+            reply = "Hmm ... not sure what you want to do? Check logbot @help to see the available commands."
 
         # Regenerate the log webpage
         self._write_log(message)