net/http: fix reference to URL.RawPath in docs
net/http: fix reference to URL.RawPath in docs

R=go.peter.90, n13m3y3r, gustavo
CC=golang-dev
http://codereview.appspot.com/5655053

Committer: Gustavo Niemeyer <beac5f8171fcde5e2ec734cc5d25d03e7362e8de@niemeyer.net>

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