RFR: 8353009: Document target selection flag for Windows AArch64 builds [v5]

[Saint Wesonga]

> The target selection configuration flag for Windows AArch64 should be added to the build documentation for improved discoverability and completeness.

Saint Wesonga has updated the pull request incrementally with one additional commit since the last revision:

  Simplify documentation
  
  Co-authored-by: Magnus Ihse Bursie <mag at icus.se>

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/24267/files
  - new: https://git.openjdk.org/jdk/pull/24267/files/01d7742c..11e906be

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24267&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24267&range=03-04

  Stats: 8 lines in 1 file changed: 0 ins; 6 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/24267.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24267/head:pull/24267

PR: https://git.openjdk.org/jdk/pull/24267