Editorial: Delete "as modified" wording in Note for JSON.parse.

PR tc39#1188 deleted the text
"but using the alternative definition of |DoubleStringCharacter| provided below"
from step 4 of JSON.parse's algorithm.

At that point, the accompanying Note's phrase
"as modified by Step 4 above"
became obsolete.

spec.html

@@ -38168,7 +38168,7 @@ <h1>JSON.parse ( _text_ [ , _reviver_ ] )</h1>
       <p>This function is the <dfn>%JSONParse%</dfn> intrinsic object.</p>
       <p>The *"length"* property of the `parse` function is 2.</p>
       <emu-note>
-        <p>Valid JSON text is a subset of the ECMAScript |PrimaryExpression| syntax as modified by Step 4 above. Step 2 verifies that _jsonString_ conforms to that subset, and step 6 verifies that that parsing and evaluation returns a value of an appropriate type.</p>
+        <p>Valid JSON text is a subset of the ECMAScript |PrimaryExpression| syntax. Step 2 verifies that _jsonString_ conforms to that subset, and step 6 verifies that that parsing and evaluation returns a value of an appropriate type.</p>
       </emu-note>
 
       <emu-clause id="sec-internalizejsonproperty" aoid="InternalizeJSONProperty">