[skip-changelog] Correct Google TLD in certificates flash example commands (#125)

Previously, the `arduino-fwuploader certificates flash` example commands in the command line help and "Usage"
documentation used the domain `google.cc` for the download of the Google SSL certificate. Although it does work
(`google.cc` redirects to `google.com`), I suspect the use of the `.cc` TLD was accidental, originating from the correct
use of that TLD for the Arduino certificate domain.

The commands are hereby updated to use `google.com`.

Author: per1234

cli/certificates/flash.go

@@ -50,7 +50,7 @@ func NewFlashCommand() *cobra.Command {
 		Long:  "Flashes specified certificates to board at specified address.",
 		Example: "" +
 			"  " + os.Args[0] + " certificates flash --fqbn arduino:samd:mkr1000 --address COM10 --url arduino.cc:443 --file /home/me/Digicert.cer\n" +
-			"  " + os.Args[0] + " certificates flash -b arduino:samd:mkr1000 -a COM10 -u arduino.cc:443 -u google.cc:443\n" +
+			"  " + os.Args[0] + " certificates flash -b arduino:samd:mkr1000 -a COM10 -u arduino.cc:443 -u google.com:443\n" +
 			"  " + os.Args[0] + " certificates flash -b arduino:samd:mkr1000 -a COM10 -f /home/me/VeriSign.cer -f /home/me/Digicert.cer\n",
 		Args: cobra.NoArgs,
 		Run:  runFlash,

docs/usage.md

@@ -71,7 +71,7 @@ You can also use the `--format json` flag to parse the output with more ease.
 The tool offers also the ability to flash SSL certificates to a module:
 
 ```
-./arduino-fwuploader certificates flash -b arduino:samd:nano_33_iot" -a COM10 -u arduino.cc:443 -u google.cc:443
+./arduino-fwuploader certificates flash -b arduino:samd:nano_33_iot" -a COM10 -u arduino.cc:443 -u google.com:443
 ```
 
 or you can specify a path to a file with `-f` instead of the URL of the certificate