[SQL] [DOC] improved a comment

[SQL][DOC] I found it a bit confusing when I came across it for the first time in the docs

Author: Radek Ostrowski <dest.hawaii@gmail.com>
Author: radek <radek@radeks-MacBook-Pro-2.local>

Closes #6332 from radek1st/master and squashes the following commits:

dae3347 [Radek Ostrowski] fixed typo
c76bb3a [radek] improved a comment