Fix example for random_bipartite
Fix example for random_bipartite

The check of a connected graph doesn't play any role in the example.
Very rarely it gave an error to nosetests.

tmilicic/networkx,RMKD/networkx,NvanAdrichem/networkx,jakevdp/networkx,aureooms/networkx,ionanrozenfeld/networkx,wasade/networkx,sharifulgeo/networkx,ionanrozenfeld/networkx,jcurbelo/networkx,ghdk/networkx,nathania/networkx,OrkoHunter/networkx,ltiao/networkx,harlowja/networkx,SanketDG/networkx,jni/networkx,ghdk/networkx,cmtm/networkx,sharifulgeo/networkx,dmoliveira/networkx,andnovar/networkx,jni/networkx,RMKD/networkx,michaelpacer/networkx,chrisnatali/networkx,debsankha/networkx,jakevdp/networkx,bzero/networkx,bzero/networkx,farhaanbukhsh/networkx,blublud/networkx,farhaanbukhsh/networkx,blublud/networkx,dhimmel/networkx,harlowja/networkx,harlowja/networkx,sharifulgeo/networkx,yashu-seth/networkx,JamesClough/networkx,kernc/networkx,beni55/networkx,aureooms/networkx,chrisnatali/networkx,jfinkels/networkx,jni/networkx,dhimmel/networkx,nathania/networkx,debsankha/networkx,ghdk/networkx,nathania/networkx,bzero/networkx,jakevdp/networkx,Sixshaman/networkx,blublud/networkx,chrisnatali/networkx,goulu/networkx,RMKD/networkx,dhimmel/networkx,aureooms/networkx,farhaanbukhsh/networkx,dmoliveira/networkx,debsankha/networkx,kernc/networkx,dmoliveira/networkx,ionanrozenfeld/networkx,kernc/networkx