Fix reference to BEL processor in documentation
Fix reference to BEL processor in documentation

pvtodorov/indra,sorgerlab/indra,johnbachman/belpy,johnbachman/indra,pvtodorov/indra,bgyori/indra,sorgerlab/belpy,johnbachman/belpy,sorgerlab/belpy,johnbachman/indra,sorgerlab/indra,johnbachman/belpy,bgyori/indra,sorgerlab/belpy,bgyori/indra,pvtodorov/indra,sorgerlab/indra,johnbachman/indra,pvtodorov/indra