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

[Erik Joelsson]

On Tue, 24 Sep 2024 12:54:49 GMT, George Adams <gdams at openjdk.org> wrote:

>> 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>
>
> sorry I manually make it a link tag, that's incorrect, I'll fix it now.

You can make it a link using markdown `[]()` syntax.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21154#discussion_r1773291766