Fix Docker image in linux-docker-web-default.php

Author: TimWolla

include/download-instructions/linux-docker-web-default.php

@@ -3,8 +3,8 @@
 </p>
 <pre><code class="language-bash line-numbers">
 # Pull the PHP Docker image.
-docker pull php-fpm
+docker pull php:fpm
 
 # Launch a container with PHP.
-docker run --rm -it --entrypoint bash php-fpm
+docker run --rm -it --entrypoint bash php:fpm
 </code></pre>