more unique differences in vds version vs hpms docs

swith nhh to not_hh in emit statements

modified:   couchdb/views/grid_to_area/lib/dump_airbasin_membership_vds.js
modified:   couchdb/views/grid_to_area/lib/dump_airdistrict_membership_vds.js
modified:   couchdb/views/grid_to_area/lib/dump_county_membership_vds.js