doc/go1.14: mention new, more efficient, timers
doc/go1.14: mention new, more efficient, timers

Change-Id: I71fc3016106db733b888f3daccc00b493abe39b2
Reviewed-on: https://go-review.googlesource.com/c/go/+/207840
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

cloudflare/go,akutz/go,nawawi/go,cloudflare/go,CAFxX/go,akutz/go,cloudflare/go,golang/go,golang/go,CAFxX/go,akutz/go,cloudflare/go,CAFxX/go,cloudflare/go,akutz/go,golang/go,nawawi/go,akutz/go,akutz/go,cloudflare/go,CAFxX/go,akutz/go,golang/go,CAFxX/go,CAFxX/go,nawawi/go,nawawi/go,golang/go,cloudflare/go,golang/go,cloudflare/go,nawawi/go,nawawi/go,CAFxX/go,nawawi/go,nawawi/go,CAFxX/go,akutz/go,golang/go,golang/go