Fixed a sphinx error
Fixed a sphinx error

silviacanessa/oq-hazardlib,gem/oq-hazardlib,silviacanessa/oq-hazardlib,rcgee/oq-hazardlib,silviacanessa/oq-hazardlib,gem/oq-hazardlib,gem/oq-engine,vup1120/oq-hazardlib,gem/oq-engine,gem/oq-engine,rcgee/oq-hazardlib,vup1120/oq-hazardlib,gem/oq-engine,gem/oq-hazardlib,silviacanessa/oq-hazardlib,vup1120/oq-hazardlib,gem/oq-engine