doc: update go1.5.txt

Change-Id: Idbceaa44f4c823510632381b36b42302e63d8a29
Reviewed-on: https://go-review.googlesource.com/10057Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

doc/go1.5.txt

 Overall:
-toolchain in Go
-new GC
+- toolchain in Go
+- new GC
 
 Language:
-permit omission of key type in map composite literals where key is a composite literal (https://golang.org/cl/2591)
+- permit omission of key type in map composite literals where key is a composite literal (https://golang.org/cl/2591)
 
 Build:
-Go 1.4 required to build (https://golang.org/cl/2470, https://golang.org/cl/2993)
+- Go 1.4 required to build (https://golang.org/cl/2470, https://golang.org/cl/2993)
 
 New Ports:
-darwin/arm, a.k.a iOS. (https://golang.org/cl/2118, 2119, 3273, 2121, 2122, ..., 2127)
-darwin/arm64
-linux/arm64 (cgo is supported, but only with external linking)
-openbsd/arm (no cgo or external linking)
-The port to Snow Leopard (OS X 10.6) is no longer actively maintained.
-
-Runtime:
-goroutine scheduling order changed; never guaranteed by language, but can break tests that implicitly assume a specific execution order
+- darwin/arm, a.k.a iOS. (https://golang.org/cl/2118, 2119, 3273, 2121, 2122, ..., 2127)
+- darwin/arm64
+- linux/arm64 (cgo is supported, but only with external linking)
+- openbsd/arm (no cgo or external linking)
 
 Removed Ports:
-dragonfly/386 (https://golang.org/cl/7543)
+- dragonfly/386 (https://golang.org/cl/7543)
+- The port to Snow Leopard (OS X 10.6) is no longer actively maintained.
+
+Runtime:
+- goroutine scheduling order changed; never guaranteed by language,
+  but can break tests that implicitly assume a specific execution
+  order
 
 API additions and behavior changes:
 
@@ -107,6 +109,8 @@ cmd/gc: allocate backing storage for non-escaping interfaces on stack (https://g
 encoding/xml: avoid an allocation for tags without attributes (https://golang.org/cl/4160)
 image: many optimizations
 runtime: add ARM runtime.cmpstring and bytes.Compare (https://golang.org/cl/8010)
+runtime: do not scan maps when k/v do not contain pointers (https://golang.org/cl/3288)
+runtime: reduce thrashing of gs between ps (https://golang.org/cl/9872)
 sort: number of Sort performance optimizations (https://golang.org/cl/2100, https://golang.org/cl/2614, ...)
 strconv: optimize decimal to string conversion (https://golang.org/cl/2105)
 strconv: optimize float to string conversion (https://golang.org/cl/5600)