update tutorial text to refer to io.Reader etc.
update tutorial text to refer to io.Reader etc.

R=rsc
DELTA=15  (0 added, 5 deleted, 10 changed)
OCL=28526
CL=28532

tianon/debian-golang,pombredanne/go-deleteme,h8liu/golang,gnanderson/go,dsriram/golang,tv42/old-go,nightlyone/golang,ssrl/go,h8liu/golang,gnanderson/go,gnanderson/go,tv42/old-go,nightlyone/golang,dsriram/golang,wesolows/golang-old,wesolows/golang,dsriram/golang,gnanderson/go,nightlyone/golang,tv42/old-go,firebitsbr/golang-old,ssrl/go,wesolows/golang,tianon/debian-golang,bdwalton/debian-golang,h8liu/golang,firebitsbr/golang-old,ssrl/go,pombredanne/go-deleteme,tv42/old-go,firebitsbr/golang-old,dsriram/golang,apparentlymart/golang,bdwalton/debian-golang,pombredanne/go-deleteme,tianon/debian-golang,wesolows/golang,ssrl/go,h8liu/golang,bdwalton/debian-golang,firebitsbr/golang-old,wesolows/golang,dsriram/golang,tianon/debian-golang,bdwalton/debian-golang,apparentlymart/golang,wesolows/golang-old,h8liu/golang,wesolows/golang-old,nightlyone/golang,ssrl/go,tv42/old-go,wesolows/golang,wesolows/golang,ssrl/go,apparentlymart/golang,wesolows/golang-old,apparentlymart/golang,firebitsbr/golang-old,firebitsbr/golang-old,tianon/debian-golang,bdwalton/debian-golang,h8liu/golang,wesolows/golang-old,gnanderson/go,nightlyone/golang,tianon/debian-golang,ssrl/go,wesolows/golang,apparentlymart/golang,bdwalton/debian-golang,bdwalton/debian-golang,pombredanne/go-deleteme,dsriram/golang,h8liu/golang,gnanderson/go,pombredanne/go-deleteme,firebitsbr/golang-old,pombredanne/go-deleteme,nightlyone/golang,tv42/old-go,pombredanne/go-deleteme,wesolows/golang-old,bdwalton/debian-golang,apparentlymart/golang,firebitsbr/golang-old,dsriram/golang,apparentlymart/golang,tv42/old-go,tianon/debian-golang,wesolows/golang-old,nightlyone/golang,tianon/debian-golang,gnanderson/go