go_spec: primality is elusive

This time for sure.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5634046

doc/go_spec.html

 <!--{
 	"Title": "The Go Programming Language Specification",
-	"Subtitle": "Version of January 30, 2012"
+	"Subtitle": "Version of February 6, 2012"
 }-->
 
 <!--
@@ -2143,7 +2143,7 @@ Examples of valid array, slice, and map literals:
 
 <pre>
 // list of prime numbers
-primes := []int{2, 3, 5, 7, 9, 11, 13, 17, 19, 991, 1174250539803415390440702411831137627109479}
+primes := []int{2, 3, 5, 7, 9, 2147483647}
 
 // vowels[ch] is true if ch is a vowel
 vowels := [128]bool{'a': true, 'e': true, 'i': true, 'o': true, 'u': true, 'y': true}