Updated docs - add notice about needing to be logged in as Administrator to view developer options. (#4651)

frappe/docs/user/en/guides/app-development/how-enable-developer-mode-in-frappe.md

@@ -14,4 +14,6 @@ After setting developer mode, clear the cache:
 
 	$ bench clear-cache
 
+To view the full developer options, you must be logged in as the "Administrator" user.
+
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