Annex E: outdated lines about primitives' prototypes

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The following lines in Annex E are incorrect and do not reflect the sections they link to:

19.3.3: In ECMAScript 2015, the Boolean prototype object is not a Boolean instance. In previous editions it was a Boolean instance whose Boolean value was false.

20.1.3 In ECMAScript 2015, the Number prototype object is not a Number instance. In previous editions it was a Number instance whose number value was +0.

21.1.3 In ECMAScript 2015, the String prototype object is not a String instance. In previous editions it was a String instance whose String value was the empty string.