LibWeb: Add comments and missing items of various IDL files

Author: https://github.com/bplaat
Commit: 169d24ae2e
Pull-request: https://github.com/SerenityOS/serenity/pull/21588

Userland/Libraries/LibWeb/CSS/StyleSheet.idl

@@ -6,10 +6,12 @@
 [Exposed=Window]
 interface StyleSheet {
 
-    readonly attribute Element? ownerNode;
     readonly attribute CSSOMString type;
-
     readonly attribute USVString? href;
+
+    // FIXME: readonly attribute (Element or ProcessingInstruction)? ownerNode;
+    readonly attribute Element? ownerNode;
+
     readonly attribute CSSStyleSheet? parentStyleSheet;
     readonly attribute DOMString? title;
     [SameObject, PutForwards=mediaText] readonly attribute MediaList media;