RFR: 8347033: [mobile] add ios-specific build docs [v3]

[Abhinay Agarwal]

On Fri, 21 Feb 2025 11:59:32 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Abhinay Agarwal has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   update note
>
> doc/building_ios.md line 44:
> 
>> 42: ```
>> 43: cd build/zero-ios-aarch64
>> 44: make static-libs-image
> 
> A simpler way to achieve this without having to change directories is by just executing `make CONF=zero-ios-aarch64 static-libs-image`.

Thanks for this 👍

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PR Review Comment: https://git.openjdk.org/mobile/pull/34#discussion_r1967234960