Fix several out-of-date comments in REPL (#2098)
Fix several out-of-date comments in REPL (#2098)

* Fix several out-of-date comments in REPL

* Add a missed period
sql-machine-learning/sqlflow,sql-machine-learning/sqlflow,sql-machine-learning/sqlflow,sql-machine-learning/sqlflow,sql-machine-learning/sqlflow,sql-machine-learning/sqlflow