Editorial: replace "IsIntegralNumber" with "is an integral Number"

see tc39/ecma262#3344

spec/abstractops.html

@@ -2051,7 +2051,7 @@ <h1>
     </dl>
     <emu-alg>
       1. Let _number_ be ? ToNumber(_argument_).
-      1. If IsIntegralNumber(_number_) is *false*, throw a *RangeError* exception.
+      1. If _number_ is not an integral Number, throw a *RangeError* exception.
       1. Return ℝ(_number_).
     </emu-alg>
   </emu-clause>