[DOCS][SQL] Fix broken link to Row class scaladoc

Author: Andy Konwinski <andykonwinski@gmail.com>

Closes #3323 from andyk/patch-2 and squashes the following commits:

4699fdc [Andy Konwinski] Fix broken link to Row class scaladoc

(cherry picked from commit cec1116b4b80c36b36a8a13338b948e4d6ade377)
Signed-off-by: Michael Armbrust <michael@databricks.com>