hashtable: update documentation
authorBrian Norris <banorris@uci.edu>
Tue, 16 Apr 2013 17:23:44 +0000 (10:23 -0700)
committerBrian Norris <banorris@uci.edu>
Tue, 16 Apr 2013 18:38:01 +0000 (11:38 -0700)
Some of the existing documentation was incorrect or insufficient. Also,
add new documentation to describe the design "feature" of this table:
that 0/NULL is not a valid key.


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