IMPLY-12348: Update description of UNION ALL in SQL syntax doc (#12710)
IMPLY-12348: Update description of UNION ALL in SQL syntax doc (#12710)

* IMPLY-12348: Updated description of UNION ALL

* Update docs/querying/sql.md

Co-authored-by: Charles Smith <5dcb72a123ff9c3f93be52b236fab0b598684c28@gmail.com>

* Update docs/querying/sql.md

Co-authored-by: Charles Smith <5dcb72a123ff9c3f93be52b236fab0b598684c28@gmail.com>

* Update sql.md

* Update docs/querying/sql.md

Co-authored-by: Victoria Lim <820b856591242699e6755d5c3d0571c6dffb34a8@users.noreply.github.com>

Co-authored-by: Charles Smith <5dcb72a123ff9c3f93be52b236fab0b598684c28@gmail.com>
Co-authored-by: Victoria Lim <820b856591242699e6755d5c3d0571c6dffb34a8@users.noreply.github.com>
monetate/druid,monetate/druid,monetate/druid,monetate/druid,monetate/druid,monetate/druid,monetate/druid