Update magento.json

AFAIK, commercial support is only available for proprietary derivative software and not for the Free Software version. See https://magento.com/sites/default/files/Magento_EE_Customer_Support_Guide_April_2017.pdf

magento.json

@@ -13,7 +13,7 @@
                 "category_list": ["Application"],
                 "source_code_download": "https://github.com/magento/magento2-community-edition/archive/master.zip",
                 "source_code_profile": "https://www.openhub.net/p/magento/analyses/latest/languages_summary",
-                "commercial_support": "https://community.magento.com/",
+                "commercial_support": "",
                 "wikipedia_url": "https://en.wikipedia.org/wiki/Magento",
                 "success_case_list": []
         }]