Update html/elements/template.json

Co-authored-by: Claas Augner <[email protected]>

Author: meyerweb

html/elements/template.json

@@ -151,8 +151,6 @@
         },
         "shadowrootreferencetarget": {
           "__compat": {
-            "mdn_url": "",
-            "spec_url": "",
             "tags": [
               "web-features:declarative-shadow-dom"
             ],