RFR: 8340804: doc/building.md update Xcode instructions to note that full install is required

[Erik Joelsson]

On Tue, 24 Sep 2024 11:21:33 GMT, George Adams <gdams at openjdk.org> wrote:

> Since JDK17 there has been a dependency on metal in the macOS builds which is only available as part of the full Xcode IDE (rather than command-line tools). We currently recommend only installing the command-line tools in the building.md doc which is incorrect.
> 
> See https://github.com/openjdk/jdk/blob/e1c4d3039f6b5106ce3f65d50f607eacc2a8d168/make/autoconf/toolchain.m4#L681

doc/building.html line 618:

> 616: <p>The oldest supported version of Xcode is 13.0.</p>
> 617: <p>You will need to download Xcode either from the App Store or specific
> 618: versions can be easily located via <a href="https://xcodereleases.com">https://xcodereleases.com</a>.</p>

If I run `make update-build-docs`, that does not turn into a link tag. Did you hand edit the html or convert it automatically?

Suggestion:

versions can be easily located via https://xcodereleases.com.</p>

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PR Review Comment: https://git.openjdk.org/jdk/pull/21154#discussion_r1773288348