Editorial: Fix check in GetModuleNamespace (tc39#1486)

Author: littledan

spec.html

@@ -22580,7 +22580,7 @@ <h1>Runtime Semantics: GetModuleNamespace ( _module_ )</h1>
 
         <emu-alg>
           1. Assert: _module_ is an instance of a concrete subclass of Module Record.
-          1. Assert: _module_.[[Status]] is not `"uninstantiated"`.
+          1. Assert: If _module_ is a Cyclic Module Record, then _module_.[[Status]] is not `"uninstantiated"`.
           1. Let _namespace_ be _module_.[[Namespace]].
           1. If _namespace_ is *undefined*, then
             1. Let _exportedNames_ be ? _module_.GetExportedNames().