Mention "PL/SQL & SQL Formatter Settings" in "Tool Support" chapter

[PhilippSalvisberg]

The tool support chapter was reworked and extended in v4.1 via #8 and #9.

IMO it would be nice to mention https://github.com/Trivadis/plsql-and-sql-coding-guidelines as well. Especially since it is used to automatically format all code in this repo.

[kibeha]

Agreed. https://github.com/Trivadis/plsql-formatter-settings should get a mention in next guideline version.