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This will allow us to mechanically substitute these strings
using javascript (in a forthcoming change to x/tools/godoc).

Updates #14371

Change-Id: I96e876283060ffbc9f3eabaf55d6b880685453e1
Reviewed-on: https://go-review.googlesource.com/22055

Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-on: https://go-review.googlesource.com/22069