[release-branch.go1.14] doc: update the minimum supported macOS version to 10.11
Update minimum macOS supported version from 10.10 to 10.11.
Updates #23011
Change-Id: Ie10c40e882c9d309ff56041d9768afc288d0204f
Reviewed-on: https://go-review.googlesource.com/c/go/+/213878
Reviewed-by: Alexander Rakoczy <alex@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Alexander Rakoczy <alex@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
(cherry picked from commit
a1bc781503bf371262d4878e96cd60cdbb5e9ee9)
Reviewed-on: https://go-review.googlesource.com/c/go/+/226859
Run-TryBot: Carlos Amedee <carlos@golang.org>