[Obo-unit] Typo in coulomb

[Xavier R. <ro...@et...>]

There is a small mistake in the definition of coulomb:

[Term]
id: UO:0000220
name: coulomb
def: "An *electric potential difference unit* which is (...)
exact_synonym: "C" []
is_a: UO:0000219 ! electric charge

Correct definition according to WordNet is 
> *a unit of electrical charge* equal to the amount of charge transferred by
> a current of 1 ampere in 1 second 

See http://wordnet.princeton.edu/perl/webwn?s=coulomb

Definition could be rewritten to:

def: "An electrical charge unit which is equal to to the amount of charge 
transferred by a current of 1 ampere in 1 second." 
[WordNet:WordNet "http://wordnet.princeton.edu/"]

Xavier