Duplicate logging note for custom logs

Added note to documentation for duplicate logging with custom logs.

example/log-label-example/README.md

@@ -6,6 +6,9 @@ logging information about a specific feature.
 
 ## Adding Custom Labels to Logs
 
+#### Important Note
+Please be aware that when adding custom logs without disabling raw logging for those specific logs, duplicate log entries will be generated: one for raw logs and another for custom logs.
+
 ### Example 1
 
 Consider the following HTML:
@@ -59,4 +62,4 @@ This event listener will now be invoked on the `customEvent` and send a custom l
 Note that we only advise adding custom event listeners in the following scenarios:
 
 1. For events not captured natively by UserALE.js (as seen above)
-2. For sending custom logs *only*
+2. For sending custom logs *only*