doc/go1.4.html: leave stack size at 2 kB

LGTM=r
R=khr, r
CC=golang-codereviews
https://golang.org/cl/165590043

doc/go1.4.html

@@ -199,7 +199,6 @@ Details are available in <a href="https://golang.org/s/contigstacks">the design
 <p>
 The use of contiguous stacks means that stacks can start smaller without triggering performance issues,
 so the default starting size for a goroutine's stack in 1.4 has been reduced to 2048 bytes from 8192 bytes.
-TODO: It may be bumped to 4096 for the release.
 </p>
 
 <p>