[jdk21u-dev] RFR: 8340804: doc/building.md update Xcode instructions to note that full install is required [v2]

[George Adams]

> Hi all,
> 
> This pull request contains a backport of commit [b639661e](https://github.com/openjdk/jdk/commit/b639661e797fb52ce32ce397a153c886fdc40f53) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by George Adams on 24 Sep 2024 and was reviewed by Erik Joelsson and Julian Waters.
> 
> Thanks!
> 
> Applies cleanly other than the fact that the minimum supported version is Xcode 8 (also some other html wasn't properly converted so my pandoc run tweaked it slightly)

George Adams has updated the pull request incrementally with one additional commit since the last revision:

  Update building.html

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

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/1019/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/1019/files/1f4027f9..74ce22a4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1019&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1019&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1019.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1019/head:pull/1019

PR: https://git.openjdk.org/jdk21u-dev/pull/1019