Editorial: minor grammar refactoring re Punctuator

Move the Punctuator production back to its former position.
(Grammars are generally written top-down.)

spec.html

@@ -11098,6 +11098,10 @@ <h2>Syntax</h2>
     <h1>Punctuators</h1>
     <h2>Syntax</h2>
     <emu-grammar type="definition">
+      Punctuator ::
+        OptionalChainingPunctuator
+        OtherPunctuator
+
       OptionalChainingPunctuator ::
         `?.` [lookahead &lt;! DecimalDigit]
 
@@ -11116,10 +11120,6 @@ <h2>Syntax</h2>
         `=` `+=` `-=` `*=` `%=` `**=` `&lt;&lt;=` `&gt;&gt;=` `&gt;&gt;&gt;=` `&amp;=` `|=` `^=`
         `=&gt;`
 
-      Punctuator ::
-        OptionalChainingPunctuator
-        OtherPunctuator
-
       DivPunctuator ::
         `/`
         `/=`
@@ -41538,9 +41538,9 @@ <h1>Lexical Grammar</h1>
     <emu-prodref name=UnicodeIDStart></emu-prodref>
     <emu-prodref name=UnicodeIDContinue></emu-prodref>
     <emu-prodref name=ReservedWord></emu-prodref>
+    <emu-prodref name=Punctuator></emu-prodref>
     <emu-prodref name=OptionalChainingPunctuator></emu-prodref>
     <emu-prodref name=OtherPunctuator></emu-prodref>
-    <emu-prodref name=Punctuator></emu-prodref>
     <emu-prodref name=DivPunctuator></emu-prodref>
     <emu-prodref name=RightBracePunctuator></emu-prodref>
     <emu-prodref name=NullLiteral></emu-prodref>