SNOW-185829 Remove the preview note from the multi-statement documentation.
SNOW-185829 Remove the preview note from the multi-statement documentation.

Description
Remove the preview note from the multi-statement documentation. Multi-statement support will be generally available as of 1.3.8.

snowflakedb/gosnowflake,snowflakedb/gosnowflake,snowflakedb/gosnowflake