[Doc][Improve] Intro the multi-line text feature in document

[nianhua99]

Purpose of this pull request

#6682

Does this PR introduce any user-facing change?

How was this patch tested?

Check list

• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update change log that in connector document. For more details you can refer to connector-v2
  2. Update plugin-mapping.properties and add new connector information in it
  3. Update the pom file of seatunnel-dist
• Update the release-note.

[Hisoka-X]

How about add this case too?

sql = """ select * from "table" """

[nianhua99]

Sure, multiline text is indeed common in long SQL queries. I will add this case.

[nianhua99]

How about add this case too?

sql = """ select * from "table" """

done

[Hisoka-X]

LGTM. Thanks @nianhua99