[css-forms-1] Add control-value() issues.

Author: nt1m

css-forms-1/Overview.bs

@@ -538,7 +538,9 @@ Markup Shorthands: css yes, markdown yes
 
   ISSUE: This is not ready for implementation, file an issue regarding this.
 
-  ISSUE: Consider privacy implications, regarding data exfiltration.
+  ISSUE(11860): Consider privacy implications, regarding data exfiltration.
+
+  ISSUE(11842): Consider adding more types.
 
   The <dfn>control-value()</dfn> function computes to the current value of the form control it is on. If it is used on an element that is not a form control,
   it returns an empty string.