The document root of your project should be a sub-directory within your project, rather than the project folder itself.
project
└── www
├── count.html.php
└── index.php
They are saying to move that file out of the document root sub-directory and put it into the project folder itself.
project
├── count.html.php
└── www
└── index.php
Since the document root of the web server would point to the www sub directory, the count.html.php file is now inaccessible by any url.