net/http: Fix a verb-tense mismatch and a typo in documentation.
net/http: Fix a verb-tense mismatch and a typo in documentation.

R=bradfitz
CC=golang-dev
http://codereview.appspot.com/6357049

Committer: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang