design/51082-godocfmt: add link to GitHub rendering with images
design/51082-godocfmt: add link to GitHub rendering with images

Sigh.

Change-Id: I771d6c075400c83a90b140402257a349fe2ae7a8
Reviewed-on: https://go-review.googlesource.com/c/proposal/+/384163
Trust: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>
Run-TryBot: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>
Reviewed-by: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>

golang/proposal,golang/proposal