use arduino-cli in examples

Author: rmetzler

Diff for: README.md

@@ -253,7 +253,7 @@ Usage:
   arduino-cli core [command]
 
 Examples:
-arduino core update-index # to update the package index file.
+arduino-cli core update-index # to update the package index file.
 
 Available Commands:
   download     Downloads one or more cores and corresponding tool dependencies.
@@ -272,4 +272,3 @@ Global Flags:
 Use "arduino-cli core [command] --help" for more information about a command.
 
 ```
-

Diff for: commands/core/install.go

@@ -33,9 +33,10 @@ func initInstallCommand() *cobra.Command {
 		Use:   "install PACKAGER:ARCH[@VERSION] ...",
 		Short: "Installs one or more cores and corresponding tool dependencies.",
 		Long:  "Installs one or more cores and corresponding tool dependencies.",
-		Example: "" +
-			"arduino core install arduino:samd       # to download the latest version of arduino SAMD core." +
-			"arduino core install arduino:samd=1.6.9 # for a specific version (in this case 1.6.9).",
+		Example: "  # download the latest version of arduino SAMD core.\n" +
+			"  " + commands.AppName + " core install arduino:samd\n\n" +
+			"  # download a specific version (in this case 1.6.9).\n" +
+			"  " + commands.AppName + " core install arduino:samd=1.6.9",
 		Args: cobra.MinimumNArgs(1),
 		Run:  runInstallCommand,
 	}