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Update the dbm documentation (GH-137919)

Unify documentation for all backends, enumerate all not implemented mapping
methods, document particularities of implemented mapping methods.
S
Serhiy Storchaka committed
8700404f8688d6a56279dce47a5a5802ec53ed06
Parent: ac37b77
Committed by GitHub <noreply@github.com> on 8/19/2025, 3:05:24 PM