Mark JS public class fields partial in Safari (#6994)

This change marks the support in Safari for public class fields
partial_implementation:true — due to the fact that while Safari does
support public *instance* fields, it does not yet support public
*static* fields. See https://bugs.webkit.org/show_bug.cgi?id=194095

Fixes #6875

javascript/classes.json

@@ -584,10 +584,14 @@
               "version_added": "51"
             },
             "safari": {
-              "version_added": "14"
+              "version_added": "14",
+              "partial_implementation": true,
+              "notes": "Doesn't support public static fields. See WebKit bug <a href='https://webkit.org/b/194095'>194095</a>."
             },
             "safari_ios": {
-              "version_added": "14"
+              "version_added": "14",
+              "partial_implementation": true,
+              "notes": "Doesn't support public static fields. See WebKit bug <a href='https://webkit.org/b/194095'>194095</a>."
             },
             "samsunginternet_android": {
               "version_added": false