phpdoc.dist.xml: Add all Symfony/Contracts for the future

Author: adriendupuis

tools/php_api_ref/phpdoc.dist.xml

@@ -10,7 +10,7 @@
         <api>
             <source dsn=".">
                 <path>vendor/ibexa/**/contracts/**/*</path>
-                <path>vendor/symfony/event-dispatcher-contracts/Event.php</path>
+                <path>vendor/symfony/*-contracts/**/*</path>
             </source>
             <ignore hidden="true" symlinks="true">
                 <path>vendor/**/Test/**/*</path>