Fix bad link in comment.

Vagrantfile

@@ -8,7 +8,7 @@ Vagrant.configure("2") do |config|
   # https://docs.vagrantup.com.
 
   # Every Vagrant development environment requires a box. You can search for
-  # boxes at https://atlas.hashicorp.com/search.
+  # boxes at https://app.vagrantup.com/boxes/search
   config.vm.box = "ubuntu/xenial64"
 
   # Provider-specific configuration so you can fine-tune various
@@ -18,7 +18,7 @@ Vagrant.configure("2") do |config|
   config.vm.provider "virtualbox" do |vb|
     # Display the VirtualBox GUI when booting the machine
     # vb.gui = true
-  
+
     # Customize the amount of resources on the VM:
     vb.cpus = 2
     vb.memory = "2048"
@@ -28,12 +28,12 @@ Vagrant.configure("2") do |config|
   config.vm.network :forwarded_port, guest: 80, host: 4567
   config.vm.network :forwarded_port, guest: 8080, host: 4568
   config.vm.synced_folder ".", "/vagrant", :owner => 'ubuntu'
-  
+
   # Enable provisioning with a shell script. Additional provisioners such as
   # Puppet, Chef, Ansible, Salt, and Docker are also available. Please see the
   # documentation for more information about their specific syntax and use.
   config.vm.provision "shell", inline: <<-SHELL
-    
+
     # Configure mysql-server package credential values.
     # NOTE: Please don't use these default values in any situation where security is a concern.
     debconf-set-selections <<< 'mysql-server mysql-server/root_password password root'
@@ -43,7 +43,7 @@ Vagrant.configure("2") do |config|
     apt-get update
     apt-get install -y git zip unzip apache2 default-jdk mysql-server
     apt-get install -y libapache2-mod-php php-mbstring php-pear php php-dev php-gd php-intl php-json php-ldap php-mysql php-soap php-xml php-curl
-    
+
     # Install composer.
     php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
     php -r "if (hash_file('SHA384', 'composer-setup.php') === trim(file_get_contents('https://composer.github.io/installer.sig'))) { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"