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

@@ -37645,7 +37645,7 @@ <h1>JSON.parse ( _text_ [ , _reviver_ ] )</h1>
         1. Let _jsonString_ be ? ToString(_text_).
         1. [id="step-json-parse-validate"] Parse ! StringToCodePoints(_jsonString_) as a JSON text as specified in ECMA-404. Throw a *SyntaxError* exception if it is not a valid JSON text as defined in that specification.
         1. Let _scriptString_ be the string-concatenation of *"("*, _jsonString_, and *");"*.
-        1. [id="step-json-parse-parse"] Let _completion_ be the result of parsing and evaluating ! StringToCodePoints(_scriptString_) as if it was the source text of an ECMAScript |Script|. The extended PropertyDefinitionEvaluation semantics defined in <emu-xref href="#sec-__proto__-property-names-in-object-initializers"></emu-xref> must not be used during the evaluation.
+        1. Let _completion_ be the result of parsing and evaluating ! StringToCodePoints(_scriptString_) as if it was the source text of an ECMAScript |Script|. The extended PropertyDefinitionEvaluation semantics defined in <emu-xref href="#sec-__proto__-property-names-in-object-initializers"></emu-xref> must not be used during the evaluation.
         1. Let _unfiltered_ be _completion_.[[Value]].
         1. [id="step-json-parse-assert-type"] Assert: _unfiltered_ is either a String, Number, Boolean, Null, or an Object that is defined by either an |ArrayLiteral| or an |ObjectLiteral|.
         1. If IsCallable(_reviver_) is *true*, then
@@ -37658,7 +37658,7 @@ <h1>JSON.parse ( _text_ [ , _reviver_ ] )</h1>
       </emu-alg>
       <p>The *"length"* property of the `parse` function is *2*<sub>𝔽</sub>.</p>
       <emu-note>
-        <p>Valid JSON text is a subset of the ECMAScript |PrimaryExpression| syntax as modified by step <emu-xref href="#step-json-parse-parse"></emu-xref> above. Step <emu-xref href="#step-json-parse-validate"></emu-xref> verifies that _jsonString_ conforms to that subset, and step <emu-xref href="#step-json-parse-assert-type"></emu-xref> asserts 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 <emu-xref href="#step-json-parse-validate"></emu-xref> verifies that _jsonString_ conforms to that subset, and step <emu-xref href="#step-json-parse-assert-type"></emu-xref> asserts that that parsing and evaluation returns a value of an appropriate type.</p>
       </emu-note>
 
       <emu-clause id="sec-internalizejsonproperty" aoid="InternalizeJSONProperty">