Fix a quick documentation typo.
Fix a quick documentation typo.

Fix the object of the sentence to agree with the plural verb.
strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test