Refactor MX records to object format

Updated MX records to use objects with target and priority.

domains/adhi.json

@@ -9,11 +9,20 @@
             "185.199.110.153",
             "185.199.111.153"
         ],
-        "MX": [
-            "10 mx.zoho.in",
-            "20 mx2.zoho.in",
-            "50 mx3.zoho.in"
-        ],
+          "MX": [
+    {
+      "target": "mx.zoho.in",
+      "priority": 10
+    },
+    {
+      "target": "mx2.zoho.in",
+      "priority": 20
+    },
+    {
+      "target": "mx3.zoho.in",
+      "priority": 50
+    }
+  ],
         "TXT": [
             "zoho-verification=zb19694310.zmverify.zoho.in",
             "v=spf1 include:zoho.in ~all"