Fixed a minor RST syntax issue

Author: javiereguiluz

setup/_update_dep_errors.rst.inc

@@ -24,7 +24,7 @@ versions of other libraries. Check your error message to debug.
 Another issue that may happen is that the project dependencies can be installed
 on your local computer but not on the remote server. This usually happens when
 the PHP versions are different on each machine. The solution is to add the
-`platform`_ config option to your `composer.json` file to define the highest
+`platform`_ config option to your ``composer.json`` file to define the highest
 PHP version allowed for the dependencies (set it to the server's PHP version).
 
 .. _`platform`: https://getcomposer.org/doc/06-config.md#platform