Update client.asciidoc
Update client.asciidoc

Remove comment about configuring the transport client in the config file

Relates to https://github.com/elastic/elasticsearch/pull/13383#issuecomment-185341750
strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test,strapdata/elassandra-test