strconv: consistent parameter names for ParseUint
strconv: consistent parameter names for ParseUint

If ParseUint is like ParseInt it should have the same parameter
names, thus rename b to to base as in ParseInt's documentation.

R=golang-dev, bradfitz
CC=golang-dev
http://codereview.appspot.com/6453152

Committer: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go