Normative: explicitly specify order of operations in MakeTime (#2120)

spec.html

@@ -28257,7 +28257,7 @@ <h1>MakeTime ( _hour_, _min_, _sec_, _ms_ )</h1>
           1. Let _m_ be ! ToInteger(_min_).
           1. Let _s_ be ! ToInteger(_sec_).
           1. Let _milli_ be ! ToInteger(_ms_).
-          1. Let _t_ be _h_ `*` msPerHour `+` _m_ `*` msPerMinute `+` _s_ `*` msPerSecond `+` _milli_, performing the arithmetic according to IEEE 754-2019 rules (that is, as if using the ECMAScript operators `*` and `+`).
+          1. Let _t_ be ((_h_ `*` msPerHour `+` _m_ `*` msPerMinute) `+` _s_ `*` msPerSecond) `+` _milli_, performing the arithmetic according to IEEE 754-2019 rules (that is, as if using the ECMAScript operators `*` and `+`).
           1. Return _t_.
         </emu-alg>
       </emu-clause>