Update configuring-superset.mdx (#18819)
Update configuring-superset.mdx (#18819)

Fixes typo dateime -> datetime
airbnb/caravel,zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,airbnb/caravel,zhouyao1994/incubator-superset,airbnb/caravel,zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,airbnb/caravel