fixup! Update document/js-api/index.bs

Author: Ms2ger

document/js-api/index.bs

@@ -403,9 +403,9 @@ A {{Module}} object represents a single WebAssembly module. Each {{Module}} obje
         1. If |externtype| is of the form [=externtype/tag=] |attribute| <var ignore>functype</var>,
             1. Assert: |attribute| is [=tagtype/attribute/exception=].
             1. If |v| does not [=implement=] {{Tag}}, throw a {{LinkError}} exception.
-            1. Let |tag| be |v|.\[[Address]].
-            1. Let |extern| be the [=external value=] [=external value/tag=] |tag|.
-            1. [=list/Append=] |extern| to |imports|.
+            1. Let |tagaddr| be |v|.\[[Address]].
+            1. Let |externtag| be the [=external value=] [=external value/tag=] |tagaddr|.
+            1. [=list/Append=] |externtag| to |imports|.
     1. Return |imports|.
 
 Note: This algorithm only verifies the right kind of JavaScript values are passed.