Editorial: modify sentences re creation of built-in functions

... now that they're all created by CreateBuiltinFunction (since tc39#1044).

(Suggested in tc39#1044 (comment))

spec.html

@@ -7934,7 +7934,7 @@ <h1>CreateBuiltinFunction ( _realm_, _steps_, _prototype_ [ , _internalSlotsList
         1. Set _func_.[[ScriptOrModule]] to *null*.
         1. Return _func_.
       </emu-alg>
-      <p>Each built-in function defined in this specification is created as if by calling the CreateBuiltinFunction abstract operation, unless otherwise specified.</p>
+      <p>Each built-in function defined in this specification is created by calling the CreateBuiltinFunction abstract operation.</p>
     </emu-clause>
   </emu-clause>
 
@@ -23853,7 +23853,7 @@ <h1>ECMAScript Standard Built-in Objects</h1>
   <p>Unless otherwise specified every built-in function and every built-in constructor has the Function prototype object, which is the initial value of the expression `Function.prototype` (<emu-xref href="#sec-properties-of-the-function-prototype-object"></emu-xref>), as the value of its [[Prototype]] internal slot.</p>
   <p>Unless otherwise specified every built-in prototype object has the Object prototype object, which is the initial value of the expression `Object.prototype` (<emu-xref href="#sec-properties-of-the-object-prototype-object"></emu-xref>), as the value of its [[Prototype]] internal slot, except the Object prototype object itself.</p>
   <p>Built-in function objects that are not identified as constructors do not implement the [[Construct]] internal method unless otherwise specified in the description of a particular function.</p>
-  <p>Unless otherwise specified, each built-in function defined in this specification is created as if by calling the CreateBuiltinFunction abstract operation (<emu-xref href="#sec-createbuiltinfunction"></emu-xref>).</p>
+  <p>Each built-in function defined in this specification is created by calling the CreateBuiltinFunction abstract operation (<emu-xref href="#sec-createbuiltinfunction"></emu-xref>).</p>
   <p>Every built-in function object, including constructors, has a `length` property whose value is an integer. Unless otherwise specified, this value is equal to the largest number of named arguments shown in the subclause headings for the function description. Optional parameters (which are indicated with brackets: `[` `]`) or rest parameters (which are shown using the form &laquo;...name&raquo;) are not included in the default argument count.</p>
   <emu-note>
     <p>For example, the function object that is the initial value of the `map` property of the Array prototype object is described under the subclause heading &laquo;Array.prototype.map (callbackFn [ , thisArg])&raquo; which shows the two named arguments callbackFn and thisArg, the latter being optional; therefore the value of the `length` property of that function object is 1.</p>