Update index.html
Update index.html

Fixing spelling mistake
jthomas/doctor-watson,cemoulto/doctor-watson,IBM-Bluemix/doctor-watson,erikasf/doctor-watson,kannanagasamy/doc-watson-kannan,jthomas/doctor-watson,IBM-Bluemix/doctor-watson,erikasf/doctor-watson,cemoulto/doctor-watson,kannanagasamy/doc-watson-kannan