chore: update license headers (#11563)

tsdoc.json

@@ -0,0 +1,15 @@
+{
+  "$schema": "https://developer.microsoft.com/json-schemas/tsdoc/v0/tsdoc.schema.json",
+
+  "extends": ["@microsoft/api-extractor/extends/tsdoc-base.json"],
+  "tagDefinitions": [
+    {
+      "tagName": "@license",
+      "syntaxKind": "modifier",
+      "allowMultiple": false
+    }
+  ],
+  "supportForTags": {
+    "@license": true
+  }
+}