Clarify that all variants include the PHP cli

Author: qedrakmar

php/content.md

@@ -36,6 +36,8 @@ For many simple, single file projects, you may find it inconvenient to write a c
 $ docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp %%IMAGE%%:7.0-cli php your-script.php
 ```
 
+Note that all variants of the `php` image contain the PHP cli.
+
 ## With Apache
 
 More commonly, you will probably want to run PHP in conjunction with Apache httpd. Conveniently, there's a version of the PHP container that's packaged with the Apache web server.