Allow pymdownx.magiclink without arguments in schema

docs/schema/extensions/pymdownx.json

@@ -298,6 +298,15 @@
         }
       ]
     },
+    {
+      "oneOf": [
+        {
+          "title": "MagicLink – Python Markdown Extensions",
+          "markdownDescription": "https://facelessuser.github.io/pymdown-extensions/extensions/magiclink/",
+          "enum": [
+            "pymdownx.magiclink"
+          ]
+        },
         {
           "type": "object",
           "properties": {
@@ -328,6 +337,8 @@
             }
           },
           "additionalProperties": false
+        }
+      ]
     },
     {
       "oneOf": [