Add missingHidden method in Context (#10411)

Author: AhmedAlaa4611

context.md

@@ -377,6 +377,7 @@ Context::onlyHidden(/* ... */);
 Context::exceptHidden(/* ... */);
 Context::allHidden(/* ... */);
 Context::hasHidden(/* ... */);
+Context::missingHidden(/* ... */);
 Context::forgetHidden(/* ... */);
 ```