programming_faq: added question on T vs *T method sets
programming_faq: added question on T vs *T method sets

Adding this question on Russ' recommendation - not sure if
there is some detail here I'm missing.

The associated discussion was:
http://groups.google.com/group/golang-nuts/t/ec6b27e332ed7f77

R=rsc, r
CC=golang-dev
http://codereview.appspot.com/887042

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