[docs] dbm doc

[Dan Stromberg]

I think the page describing the dbm module could be a little more clear.
 It's at http://docs.python.org/library/dbm.html

First it says it's an interface to ndbm, then it says it could be used with
an ndbm, gdbm or berkeley db interface.

I submit that it's not an interface to ndbm, but rather provides something
that looks like ndbm at the Python API layer, and that it's not used with
different interfaces, but rather with a consistent interface having
potentially inconsistent (from one machine to another) backend
implementations (IOW, not necessarily always the same on-disk representation
of the same key-value pairs).

-- 
Dan Stromberg
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