fix: fix typo in lib/init/build.zig

[kxxt]

releative -> relevant

It doesn't look like it should be "relative" because it is referring to the relevant target field.

desireable -> desirable

I spotted the typos in the first zig project I just created.

[squeek502]

Thanks for your interest, but the goal is to address typos all at once: #21660

[kxxt]

Thanks for your interest, but the goal is to address typos all at once: #21660

I appreciate your goal for addressing all typos at once. But personally I don't think automated typo corrector would do it right for this one.

The linked commit paaloeye@989b69d in that issue changed releative to relative, which made it typo-free but got the semantic wrong since it should be relevant.

[linusg]

The intent is to have a spell checker, not spell corrector - correction is still up to humans.