Adding metadata

docfx.json

@@ -232,6 +232,7 @@
         "**/com.azure.core.management**.yml": "azure",
         "**/com.azure.messaging**.yml": "azure",
         "**/com.azure.resourcemanager.cdn**.yml": "frontdoor",
+        "**/com.azure.resourcemanager.dnsresolver**.yml": "dns",
         "**/com.azure.resourcemanager.kusto**.yml": "data-explorer",
         "**/com.azure.resourcemanager.videoanalyzer**.yml": "azure-video-analyzer",
         "**/com.microsoft.aad.adal**.yml": "active-directory",