doc/devel: release notes tweak

R=r
CC=golang-dev
https://golang.org/cl/3707041

doc/devel/release.html

@@ -79,7 +79,7 @@ If necessary, the NaCl code can be recovered from the repository history.
 * os: fix test of RemoveAll.
 * os/inotify: new package (thanks Balazs Lecz).
 * os: make MkdirAll work with symlinks (thanks Ryan Hitchman).
-* regexp: simplify code for brackets, speed up by about 30%.
+* regexp: speed up by about 30%; also simplify code for brackets.
 * runtime/linux/386: set FPU to 64-bit precision.
 * runtime: remove paranoid mapping at 0.
 * suffixarray: add Bytes function.