gh-123295: Update TSAN suppression comment and sample for set_default_allocator_unlocked #123391

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pkg-config 0.29.2_3 is already installed and up-to-date. To reinstall 0.29.2_3, run: brew reinstall pkg-config

xz 5.6.2 is already installed and up-to-date. To reinstall 5.6.2, run: brew reinstall xz

gdbm 1.24 is already installed and up-to-date. To reinstall 1.24, run: brew reinstall gdbm

HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK is set: not checking for outdated dependents or dependents with broken linkage!