Fixed span example error
Fixed span example error

Span as written gives empty text.
raphael0202/spaCy,explosion/spaCy,honnibal/spaCy,honnibal/spaCy,spacy-io/spaCy,spacy-io/spaCy,raphael0202/spaCy,recognai/spaCy,spacy-io/spaCy,spacy-io/spaCy,raphael0202/spaCy,aikramer2/spaCy,explosion/spaCy,explosion/spaCy,raphael0202/spaCy,explosion/spaCy,recognai/spaCy,aikramer2/spaCy,honnibal/spaCy,aikramer2/spaCy,recognai/spaCy,aikramer2/spaCy,raphael0202/spaCy,spacy-io/spaCy,aikramer2/spaCy,aikramer2/spaCy,recognai/spaCy,recognai/spaCy,recognai/spaCy,raphael0202/spaCy,spacy-io/spaCy,honnibal/spaCy,explosion/spaCy,explosion/spaCy