Fix reference to get follower stats API
Fix reference to get follower stats API

This commit fixes a reference to the CCR get follower stats API in the
CCR getting started docs.

strapdata/elassandra,strapdata/elassandra,strapdata/elassandra,vroyer/elassandra,vroyer/elassandra,strapdata/elassandra,vroyer/elassandra,strapdata/elassandra