Chore: Format style guide links so they can be clicked (#12189)

* Properly format styleguide links

When using the initializer and coming to style guide step, visual studio code terminal doesn't properly format style guide links so when user clicks on one of the links it takes them to e.q `https://github.com/airbnb/javascript)` (note the `)` at the end) 
Putting spaces between links and opening and closing braces fixes this.

* Remove braces around links

Remove braces around links and add a colon at the beginning.

lib/init/config-initializer.js

@@ -523,9 +523,9 @@ function promptUser() {
             name: "styleguide",
             message: "Which style guide do you want to follow?",
             choices: [
-                { name: "Airbnb (https://github.com/airbnb/javascript)", value: "airbnb" },
-                { name: "Standard (https://github.com/standard/standard)", value: "standard" },
-                { name: "Google (https://github.com/google/eslint-config-google)", value: "google" }
+                { name: "Airbnb: https://github.com/airbnb/javascript", value: "airbnb" },
+                { name: "Standard: https://github.com/standard/standard", value: "standard" },
+                { name: "Google: https://github.com/google/eslint-config-google", value: "google" }
             ],
             when(answers) {
                 answers.packageJsonExists = npmUtils.checkPackageJson();