Editorial: Improve consistency of referring to String values (#667)

Ref tc39/ecma262#2711

Author: gibson042

spec/numberformat.html

@@ -1040,7 +1040,7 @@ <h1>ToRawPrecision ( _x_, _minPrecision_, _maxPrecision_ )</h1>
           1. Let _int_ be _e_+1.
         1. Else,
           1. Assert: _e_ < 0.
-          1. Let _m_ be the string-concatenation of the String value *"0."*, –(_e_+1) occurrences of the character *"0"*, and _m_.
+          1. Let _m_ be the string-concatenation of *"0."*, –(_e_+1) occurrences of the character *"0"*, and _m_.
           1. Let _int_ be 1.
         1. If _m_ contains the character *"."*, and _maxPrecision_ > _minPrecision_, then
           1. Let _cut_ be _maxPrecision_ – _minPrecision_.
@@ -1065,7 +1065,7 @@ <h1>ToRawFixed ( _x_, _minInteger_, _minFraction_, _maxFraction_ )</h1>
         1. Let _f_ be _maxFraction_.
         1. Let _n_ be an integer for which the exact mathematical value of _n_ / 10<sup>_f_</sup> – _x_ is as close to zero as possible. If there are two such _n_, pick the larger _n_.
         1. Let _xFinal_ be _n_ / 10<sup>_f_</sup>.
-        1. If _n_ = 0, let _m_ be the String *"0"*. Otherwise, let _m_ be the String consisting of the digits of the decimal representation of _n_ (in order, with no leading zeroes).
+        1. If _n_ = 0, let _m_ be *"0"*. Otherwise, let _m_ be the String consisting of the digits of the decimal representation of _n_ (in order, with no leading zeroes).
         1. If _f_ ≠ 0, then
           1. Let _k_ be the number of characters in _m_.
           1. If _k_ ≤ _f_, then