Link WebKit bug for document.fragementDirective (#22965)

* Link WebKit bug for document.fragementDirective

* Update Document.json

Author: foolip

api/Document.json

@@ -3513,7 +3513,8 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": false
+              "version_added": false,
+              "impl_url": "https://webkit.org/b/273466"
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",

api/FragmentDirective.json

@@ -26,7 +26,8 @@
           "opera": "mirror",
           "opera_android": "mirror",
           "safari": {
-            "version_added": false
+            "version_added": false,
+            "impl_url": "https://webkit.org/b/273466"
           },
           "safari_ios": "mirror",
           "samsunginternet_android": "mirror",