rpi-eeprom-config: fix rpi-eeprom-dgst typo in usage-text

Author: lurch

rpi-eeprom-config

@@ -543,7 +543,7 @@ See 'rpi-eeprom-update -h' for more information about the available EEPROM image
     parser.add_argument('-c', '--config', help='Name of bootloader configuration file', required=False)
     parser.add_argument('-e', '--edit', action='store_true', default=False, help='Edit the current EEPROM config')
     parser.add_argument('-o', '--out', help='Name of output file', required=False)
-    parser.add_argument('-d', '--digest', help='Signed boot only. The name of the .sig file generated by rpi-eeprom-dgst for config.txt ', required=False)
+    parser.add_argument('-d', '--digest', help='Signed boot only. The name of the .sig file generated by rpi-eeprom-digest for config.txt ', required=False)
     parser.add_argument('-p', '--pubkey', help='Signed boot only. The name of the RSA public key file to store in the EEPROM', required=False)
     parser.add_argument('-x', '--extract', action='store_true', default=False, help='Extract the modifiable files (boot.conf, pubkey, signature)', required=False)
     parser.add_argument('-b', '--bootcode', help='Signed boot 2712 only. The name of the customer signed bootcode.bin file to store in the EEPROM', required=False)