Add reflect.FuncOf to docs/go1.5.text

Change-Id: I6089cebf7de73ce9c4e53ad3e8ef2673d970bda2
Reviewed-on: https://go-review.googlesource.com/8908Reviewed-by: Rob Pike <r@golang.org>

doc/go1.5.txt

@@ -42,6 +42,7 @@ net/http: ignore the Unix epoch time in ServeContent (https://golang.org/cl/7915
 net/http/cgi: fix REMOTE_ADDR, REMOTE_HOST, add REMOTE_PORT (https://golang.org/cl/4933)
 net/smtp: add TLSConnectionState accessor (https://golang.org/cl/2151)
 os/signal: add Ignore and Reset (https://golang.org/cl/3580)
+reflect: add FuncOf (https://golang.org/cl/1996)
 runtime, syscall: use SYSCALL instruction on FreeBSD (Go 1.5 now requires FreeBSD 8-STABLE+) (https://golang.org/cl/3020)
 runtime, syscall: use get_random_bytes syscall for NaCl (Go 1.5 now requires NaCl SDK pepper-39 or above) (https://golang.org/cl/1755)
 strings: add Compare(x, y string) int, for symmetry with bytes.Compare (https://golang.org/cl/2828)