* added links and edited headings

* documented getCallerClass error

* Added create directory section

* Wording and spacing edits per Jeff feedback

* Fixing error in ToC from last commit

* punctuation and spacing

Co-authored-by: ft-metabase <ft-metabase@ft-metabases-MacBook-Pro.local>
Co-authored-by: Jeff Bruemmer <jeff@metabase.com>