Fix capitalization

spec.emu

@@ -389,7 +389,7 @@ contributors: Ron Buckton, Ecma International
         1. Let _ref_ be ? Evaluation of _expr_.
         1. Let _extractor_ be ? GetValue(_ref_).
         1. If _ref_ is a Reference Record and IsPropertyReference(_ref_) is *true*, let _receiver_ be GetThisValue(_ref_).
-        1. Else, Let _receiver_ be *null*.
+        1. Else, let _receiver_ be *null*.
         1. Let _iteratorRecord_ be ? InvokeCustomMatcherOrThrow(_extractor_, _value_, _receiver_).
         1. Let _result_ be ? IteratorBindingInitialization of this |ExtractorBindingPattern| with arguments _iteratorRecord_ and _environment_.
         1. If _iteratorRecord_.[[Done]] is *false*, return ? IteratorClose(_iteratorRecord_, _result_).