build_bug.h: correct function parameters names in kernel-doc

build_bug.h: correct function parameters names in kernel-doc

Use the correct function (or macro) names to avoid kernel-doc warnings:

Warning: include/linux/build_bug.h:38 function parameter 'cond' not
 described in 'BUILD_BUG_ON_MSG'
Warning: include/linux/build_bug.h:38 function parameter 'msg' not
 described in 'BUILD_BUG_ON_MSG'
Warning: include/linux/build_bug.h:76 function parameter 'expr' not
 described in 'static_assert'

Link: https://lkml.kernel.org/r/20260302005144.3467019-1-rdunlap@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>