Make PHP syntax highlighting work on GitHub

Author: scheb

Resources/doc/backup_codes.md

@@ -18,6 +18,7 @@ Backup codes have to be provided from the user object. The user entity has to im
 `Scheb\TwoFactorBundle\Model\BackupCodeInterface`. Here's an example:
 
 ```php
+<?php
 
 namespace Acme\DemoBundle\Entity;
 

Resources/doc/installation.md

@@ -21,6 +21,8 @@ composer require scheb/two-factor-bundle
 Enable this bundle in your `config/bundles.php`:
 
 ```php
+<?php
+
 return [
 	// ...
     Scheb\TwoFactorBundle\SchebTwoFactorBundle::class => ['all' => true],

Resources/doc/providers/email.md

@@ -40,6 +40,8 @@ Your user entity has to implement `Scheb\TwoFactorBundle\Model\Email\TwoFactorIn
 be persisted, so make sure that it is stored in a persisted field.
 
 ```php
+<?php
+
 namespace Acme\DemoBundle\Entity;
 
 use Doctrine\ORM\Mapping as ORM;
@@ -103,6 +105,8 @@ By default the email is plain text and very simple. If you want a different styl
 own mailer service. It must implement `Scheb\TwoFactorBundle\Mailer\AuthCodeMailerInterface`.
 
 ```php
+<?php
+
 namespace Acme\DemoBundle\Mailer;
 
 use Scheb\TwoFactorBundle\Model\Email\TwoFactorInterface;

Resources/doc/providers/google.md

@@ -29,6 +29,8 @@ Your user entity has to implement `Scheb\TwoFactorBundle\Model\Google\TwoFactorI
 Authenticator for a user, generate a secret code and persist it with the user entity.
 
 ```php
+<?php
+
 namespace Acme\DemoBundle\Entity;
 
 use Doctrine\ORM\Mapping as ORM;
@@ -104,6 +106,8 @@ $secret = $container->get("scheb_two_factor.security.google_authenticator")->gen
 With Symfony 4, you can use auto-wiring dependency injection to get the services:
 
 ```php
+<?php
+
 use Scheb\TwoFactorBundle\Security\TwoFactor\Provider\Google\GoogleAuthenticatorInterface;
 
 public function generateSecret(GoogleAuthenticatorInterface $googleAuthenticatorService)

Resources/doc/providers/totp.md

@@ -34,6 +34,8 @@ We warned, custom configurations will not be compatible with the defaults of Goo
 have to use another application (e.g. FreeOTP on Android).
 
 ```php
+<?php
+
 namespace Acme\DemoBundle\Entity;
 
 use Doctrine\ORM\Mapping as ORM;
@@ -119,6 +121,8 @@ $secret = $container->get("scheb_two_factor.security.totp_authenticator")->gener
 With Symfony 4, you can use auto-wiring dependency injection to get the services:
 
 ```php
+<?php
+
 use Scheb\TwoFactorBundle\Security\TwoFactor\Provider\Totp\TotpAuthenticatorInterface;
 
 public function generateSecret(TotpAuthenticatorInterface $totpAuthenticatorService)

Resources/doc/trusted_device.md

@@ -25,6 +25,8 @@ cookies at once, e.g. in case of a security breach. To make use of this feature,
 `Scheb\TwoFactorBundle\Model\TrustedDeviceInterface` in the user entity.
 
 ```php
+<?php
+
 namespace Acme\DemoBundle\Entity;
 
 use Doctrine\ORM\Mapping as ORM;