Fixed code block rendering

Author: wouterj

components/process.rst

@@ -394,7 +394,7 @@ Using a Prepared Command Line
 
 You can run a process by using a prepared command line with double quote
 variable notation. This allows you to use placeholders so that only the
-parameterized values can be changed, but not the rest of the script:
+parameterized values can be changed, but not the rest of the script::
 
     use Symfony\Component\Process\Process;