gh-110383: Update dict `get`, `fromkeys`, and `setdefault` signatures in docs #113228

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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 5.4.6 is already installed and up-to-date. To reinstall 5.4.6, run: brew reinstall xz

gdbm 1.23 is already installed and up-to-date. To reinstall 1.23, run: brew reinstall gdbm

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