[release-branch.go1.14] doc/go1.14: add link to module migration guide
Adding a link to this guide will provide more value to instructing Go
users to migrate to modules.
Updates #36878
Change-Id: Ie6ab45efcd35cc5e5ba5adc16ba0ca4cca4292bc
Reviewed-on: https://go-review.googlesource.com/c/go/+/220906
Run-TryBot: Alexander Rakoczy <alex@golang.org>
Reviewed-by: thepudds <thepudds1460@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
(cherry picked from commit
8e2dad5529d250d548e87720741d20e88a1dfaf2)
Reviewed-on: https://go-review.googlesource.com/c/go/+/220981
Reviewed-by: Carlos Amedee <carlos@golang.org>