getUserDetails commenting missing some needed keys

[bluebaroncanada]

The comments for UserCredentialsInterface are missing some keys

    /**
     * @return
     * ARRAY the associated "user_id" and optional "scope" values
     * This function MUST return FALSE if the requested user does not exist or is
     * invalid. "scope" is a space-separated list of restricted scopes.
     * @code
     * return array(
     *     "user_id"  => USER_ID,    // REQUIRED user_id to be stored with the authorization code or access token
     *     "scope"    => SCOPE       // OPTIONAL space-separated list of restricted scopes
     * );
     * @endcode
     */
    public function getUserDetails($username);

In the UserCredentialsTest

       $user = $storage->getUserDetails('testusername');
        $this->assertTrue($user !== false);
        $this->assertArrayHasKey('user_id', $user);
        $this->assertArrayHasKey('first_name', $user);
        $this->assertArrayHasKey('last_name', $user);
        $this->assertEquals($user['user_id'], 'testusername');
        $this->assertEquals($user['first_name'], 'Test');
        $this->assertEquals($user['last_name'], 'User');