doc/go1.2.txt: compress/flate changes

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/13324046

doc/go1.2.txt

@@ -31,6 +31,7 @@ cmd/go: delete 'go doc' (CL 12974043).
 archive/zip: add File.DataOffset accessor (CL 12784045).
 bufio: add Reset methods to Reader and Writer (CL 12603049).
 compress/bzip2: support concatenated files (CL 12387044).
+compress/flate: implement Reset method on Writer (CL 12265043).
 container/heap: added Fix (CL 12265043).
 container/list: added MoveBefore and MoveAfter (CL 12021044).
 crypto/cipher: AES-GCM mode (CL 12375043).