Editorial: Remove a few <emu-prodref>s from Annex A (tc39#1868)

... that I should have removed back in 573e382 (PR tc39#370).

spec.html

@@ -41899,13 +41899,6 @@ <h1>Number Conversions</h1>
     <emu-prodref name="StrNumericLiteral"></emu-prodref>
     <emu-prodref name="StrDecimalLiteral"></emu-prodref>
     <emu-prodref name="StrUnsignedDecimalLiteral"></emu-prodref>
-    <emu-prodref name="DecimalDigits"></emu-prodref>
-    <emu-prodref name="DecimalDigit"></emu-prodref>
-    <emu-prodref name="ExponentPart"></emu-prodref>
-    <emu-prodref name="ExponentIndicator"></emu-prodref>
-    <emu-prodref name="SignedInteger"></emu-prodref>
-    <emu-prodref name="HexIntegerLiteral"></emu-prodref>
-    <emu-prodref name="HexDigit"></emu-prodref>
     <p>All grammar symbols not explicitly defined by the |StringNumericLiteral| grammar have the definitions used in the <emu-xref href="#sec-literals-numeric-literals">Lexical Grammar for numeric literals</emu-xref>.</p>
   </emu-annex>