Minor fixes in the frog example README.md
Minor fixes in the frog example README.md

yantrabuddhi/atomspace,AmeBel/atomspace,AmeBel/atomspace,yantrabuddhi/atomspace,misgeatgit/atomspace,misgeatgit/atomspace,inflector/atomspace,AmeBel/atomspace,rTreutlein/atomspace,inflector/atomspace,misgeatgit/atomspace,ArvinPan/atomspace,rTreutlein/atomspace,ArvinPan/atomspace,ArvinPan/atomspace,yantrabuddhi/atomspace,AmeBel/atomspace,inflector/atomspace,rTreutlein/atomspace,inflector/atomspace,inflector/atomspace,AmeBel/atomspace,ArvinPan/atomspace,misgeatgit/atomspace,rTreutlein/atomspace,misgeatgit/atomspace,yantrabuddhi/atomspace,yantrabuddhi/atomspace,rTreutlein/atomspace