message: docs: Update frequently-asked-questions-page.mdx
  * Update frequently-asked-questions-page.mdx
  refine answer for first question, added SQL Lab query description.
  * fix EOL lint
diff: @@ -24,6 +24,9 @@ will do its own _GROUP BY_ and doing the work twice might slow down performance.
  Whether you use a table or a view, the important factor is whether your database is fast enough to
  serve it in an interactive fashion to provide a good user experience in Superset.
  +However, if you are using the SQL Lab, there is no such limitation, you can write sql query to join
  +multiple tables as long as your db account has access to the tables.
  +
  ### How BIG can my datasource be?
  It can be gigantic! Superset acts as a thin layer above your underlying databases or data engines.
  