source/base [docs]: corrected docstring in iter_ruptures()
source/base [docs]: corrected docstring in iter_ruptures()

silviacanessa/oq-hazardlib,rcgee/oq-hazardlib,mmpagani/oq-hazardlib,ROB-Seismology/oq-hazardlib,gem/oq-hazardlib,g-weatherill/oq-hazardlib,g-weatherill/oq-hazardlib,silviacanessa/oq-hazardlib,g-weatherill/oq-hazardlib,larsbutler/oq-hazardlib,mmpagani/oq-hazardlib,g-weatherill/oq-hazardlib,gem/oq-hazardlib,silviacanessa/oq-hazardlib,larsbutler/oq-hazardlib,vup1120/oq-hazardlib,ROB-Seismology/oq-hazardlib,silviacanessa/oq-hazardlib,ROB-Seismology/oq-hazardlib,gem/oq-hazardlib,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,rcgee/oq-hazardlib,larsbutler/oq-hazardlib,mmpagani/oq-hazardlib,vup1120/oq-hazardlib,vup1120/oq-hazardlib,ROB-Seismology/oq-hazardlib,gem/oq-engine