Delete useless compatibility matrix

Author: tomglvng

content/php-client/introduction.md

@@ -3,15 +3,6 @@
 
 The PHP client facilitates the usage of the REST API in your PHP projects when building extensions and/or tools for your favorite PIM.
 
-There are several versions of these clients:
-- The version v1.0 is compatible with the PIM 2.0.
-- The version v2.0 is compatible with the PIM 2.1 and 2.2.
-- The version v3.0 is compatible with the PIM 2.3.
-- The version v4.0 is compatible with the PIM 3.0 and 3.1.
-- The version v5.0 is compatible with the PIM 3.2 and 4.0.
-- The version v6.0 is compatible with the PIM 5.0.
-- The current next and latest versions are compatible with the PIM 6.0 and the SaaS versions.
-
 ## Support & issues
 Please be aware that the PHP client is only supported **in best effort**, whether you are an Enterprise or Community customer.