Fix doctests in quickstart.rst
Fix doctests in quickstart.rst

jcalbert/TextBlob,IrisSteenhout/TextBlob,beni55/TextBlob,jonmcoe/TextBlob,adelq/TextBlob,nvoron23/TextBlob,dipeshtech/TextBlob,freakynit/TextBlob,sloria/TextBlob,laugustyniak/TextBlob,Windy-Ground/TextBlob,sargam111/python