RFR: 8347033: [mobile] add ios-specific build docs [v2]

[Johan Vos]

On Wed, 19 Feb 2025 18:44:19 GMT, Abhinay Agarwal <duke at openjdk.org> wrote:

>> Adds build instruction for iOS
>
> Abhinay Agarwal has updated the pull request incrementally with one additional commit since the last revision:
> 
>   replace build instructions for macos with a note

doc/building_ios.md line 5:

> 3: > [!NOTE]
> 4: > Follow the instructions in [building.md](building.md) to make sure you can build the JDK
> 5: > targeting a desktop platform before trying to build for iOS

instead of "a desktop platform" it is probably better to mention the mac platform explicitly, as we want to make it clear that you (currently) can not build the iOS SDK from a windows or linux system.

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PR Review Comment: https://git.openjdk.org/mobile/pull/34#discussion_r1962996861