[release-branch.go1.9] doc/1.9: add mention of net/http.LocalAddrContextKey
Fixes #21603
Reviewed-on: https://go-review.googlesource.com/59530 Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-on: https://go-review.googlesource.com/59670 Reviewed-by: Chris Broadfoot <cbro@golang.org> Reviewed-by: Tom Bergan <tombergan@google.com>
Change-Id: Ie9732d57948593dc0306a4a649664eedb3de370c
Reviewed-on: https://go-review.googlesource.com/68232 Reviewed-by: Chris Broadfoot <cbro@golang.org>