add extra info about exact match

user-guide/Reference/Skyline_DataMiner_Folder/More_information_on_certain_files_and_folders/PortLog_txt.md

@@ -40,3 +40,4 @@ Example:
 >
 > - Although the local DataMiner port is optional, each line must contain three colons (":").
 > - Logging is started when the port in question is initialized, i.e. when the element is restarted or when the IP address or the IP port of the element is changed.
+> - The IP addresses provided in the PortLog.txt file must match **exactly** with those provided in the element port settings. For example, using `localhost` and `127.0.0.1` in combination with each other will not work.