restart-footnote-numbering-in-each-sect1

hi.
https://www.postgresql.org/docs/current/tutorial-window.html#id-1.4.5.6.9.5
"""
[5] There are options to define the window frame in other ways, but
this tutorial does not cover them. See Section 4.2.8 for details.
"""

Why is "[5]"?
I think generally we want to restart the footnote numbering in each sect1?

related post I found:
https://stackoverflow.com/questions/8520254/restart-footnote-numbering-in-each-sect1-in-docbook