Clarify Delta & SCARA config location (#20403)

Marlin/Configuration.h

 //===========================================================================
 //============================= DELTA Printer ===============================
 //===========================================================================
-// For a Delta printer start with one of the configuration files in the
-// config/examples/delta directory and customize for your machine.
+// For a Delta printer, start with one of the configuration files in the config/examples/delta directory
+// from https://github.com/MarlinFirmware/Configurations/branches/all and customize for your machine.
 //
 
 //===========================================================================
 //============================= SCARA Printer ===============================
 //===========================================================================
-// For a SCARA printer start with the configuration files in
-// config/examples/SCARA and customize for your machine.
+// For a SCARA printer, start with one of the configuration files in the config/examples/SCARA directory
+// from https://github.com/MarlinFirmware/Configurations/branches/all and customize for your machine.
 //
 
 // @section info