Update note on Get-Help command usage

Added note about URI/URL requirement for online help.

Author: Rob-Barefoot

learn-pr/wwl-azure/understand-command-syntax-windows-powershell/includes/5-display-about-files-content-powershell.md

@@ -18,6 +18,8 @@ You can also open the help topic in a separate window or online:
 Get-Help about_CommonParameters -ShowWindow
 Get-Help about_CommonParameters -Online
 ```
+> [!NOTE]
+> For the online version to show, it must have the URI/URL included in the information in the local help files. If the URI/URL is not included in the local version, you will receive an error.
 
 When you use wildcard characters with the **Get-Help** command, **About** help files will appear in a list when their titles contain a match for your wildcard pattern. Typically, **About** help files will appear last, after any commands whose names also matched your wildcard pattern. You can also use the *‑Category* parameter to specify a search for **About** files.