Fix parameter name inconsistencies in index.html

[wtokuno]

Almost all Collection functions have the parameter named list but one of the collection function partition takes the parameter named array.
Similary the sortedIndex is an Array function, but it takes the parameter named list.

[coveralls]

Coverage remained the same at 96.763% when pulling aa09165 on wtokuno:master into e944e02 on jashkenas:master.

[akre54]

Thanks