Editorial: Fix mistake in para in Annex A (tc39#1868)

We're talking about
    AsyncArrowFunction : CoverCallExpressionAndAsyncArrowHead
so change
    CoverParenthesizedExpressionAndArrowParameterList
to
    CoverCallExpressionAndAsyncArrowHead

spec.html

@@ -41837,7 +41837,7 @@ <h1>Functions and Classes</h1>
     <emu-prodref name="AsyncConciseBody"></emu-prodref>
     <emu-prodref name="AsyncArrowBindingIdentifier"></emu-prodref>
     <emu-prodref name="CoverCallExpressionAndAsyncArrowHead"></emu-prodref>
-    <p>When the production <emu-prodref name="AsyncArrowFunction" a="callcover"></emu-prodref> is recognized the following grammar is used to refine the interpretation of |CoverParenthesizedExpressionAndArrowParameterList|:</p>
+    <p>When the production <emu-prodref name="AsyncArrowFunction" a="callcover"></emu-prodref> is recognized the following grammar is used to refine the interpretation of |CoverCallExpressionAndAsyncArrowHead|:</p>
     <emu-prodref name="AsyncArrowHead"></emu-prodref>
     <p>&nbsp;</p>
     <emu-prodref name="MethodDefinition"></emu-prodref>