Add note about setting WSL starting directory

Author: mattwojo

TerminalDocs/customize-settings/profile-settings.md

@@ -76,6 +76,9 @@ This is the directory the shell starts in when it is loaded.
 
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+> [!NOTE]
+> When setting the starting directory that your installed WSL distributions open to, you should use this format: "startingDirectory": "//wsl$/<distro name>", replacing with the name of your distribution. For example, "startingDirectory": "//wsl$/Ubuntu-20.04".
+
 ___
 
 ## Dropdown settings