fmt: document some undocumented details Better explanation of width for floating-point values. Explain that scanning does not handle %#q etc.
fmt: document some undocumented details
Better explanation of width for floating-point values.
Explain that scanning does not handle %#q etc.

Fixes issue 4202.
Fixes issue 4206.

R=golang-dev, adg, rsc, iant
CC=golang-dev
http://codereview.appspot.com/6620074

wesolows/golang,wesolows/golang-old,wesolows/golang-old,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old,wesolows/golang,wesolows/golang,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang,wesolows/golang-old