git: openjdk/jdk17u-dev: 8273497: building.md should link to both md and html

[Paul Hohensee]

Changeset: a10bb08a
Author:    Ben Taylor <btaylor at openjdk.org>
Committer: Paul Hohensee <phh at openjdk.org>
Date:      2022-11-29 18:48:55 +0000
URL:       https://git.openjdk.org/jdk17u-dev/commit/a10bb08a4c187c6c0b21cafb25877895d885427e

8273497: building.md should link to both md and html

Backport-of: 5bfd043e16fa79a101a1bee38c59d42d4cd69a48

! doc/building.html
! doc/building.md