RFR: 8356686: doc/building.html is not up to date after JDK-8301971

[Kim Barrett]

Please review this change to doc/building.html.  The change is the result of
using `make update-build-docs` to regenerate it from the current building.md
file.

-------------

Commit messages:
 - use update-build-docs result

Changes: https://git.openjdk.org/jdk/pull/25168/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25168&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8356686
  Stats: 13 lines in 1 file changed: 5 ins; 8 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/25168.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25168/head:pull/25168

PR: https://git.openjdk.org/jdk/pull/25168