update document

Author: bestlong

DOCUMENTATION/content/introduction/index.md

@@ -12,7 +12,7 @@ Supporting a variety of common services, all pre-configured to provide a full PH
 <a name="features"></a>
 ## Features
 
-- Easy switch between PHP versions: 7.3, 7.2, 7.1, 5.6...
+- Easy switch between PHP versions: 7.4, 7.3, 7.2, 7.1, 5.6...
 - Choose your favorite database engine: MySQL, Postgres, MariaDB...
 - Run your own stack: Memcached, HHVM, RabbitMQ...
 - Each software runs on its own container: PHP-FPM, NGINX, PHP-CLI...

env-example

@@ -37,7 +37,8 @@ COMPOSE_PROJECT_NAME=laradock
 
 ### PHP Version ###########################################
 
-# Select a PHP version of the Workspace and PHP-FPM containers (Does not apply to HHVM). Accepted values: 7.3 - 7.2 - 7.1 - 7.0 - 5.6
+# Select a PHP version of the Workspace and PHP-FPM containers (Does not apply to HHVM).
+# Accepted values: 7.4 - 7.3 - 7.2 - 7.1 - 7.0 - 5.6
 PHP_VERSION=7.3
 
 ### Phalcon Version ###########################################