Add additional utility methods to DeclarationReference

Author: rbuckton

common/changes/@microsoft/tsdoc/beta-declref-utility_2022-05-16-07-02.json

@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "@microsoft/tsdoc",
+      "comment": "add utility methods to DeclarationReference components",
+      "type": "minor"
+    }
+  ],
+  "packageName": "@microsoft/tsdoc",
+  "email": "[email protected]"
+}