Alphabetize authors by last name.

Note: leaving myself for now as first author til I can confirm Sylvain is OK
ending up first, as his last name would put him first on the list. I don't want
to do that in case he prefers not to appear listed first. Otherwise the
previous order was more or less random as it came from typing in names from a
Zoom call as I saw them on the window.

Author: fperez

NN-notebook-v7/notebook-v7.md

@@ -1,6 +1,6 @@
 ---
 title: Jupyter Notebook version 7
-authors: Fernando Pérez (@fperez), Jeremy Tuloup (@jtpio), Sharan Foga (@sharanf), Afshin Darian (@afshin), Brian Granger (@ellisonbg), Sylvain Corlay (@SylvainCorlay), Jason Grout (@jasongrout), Zach Sailer (@Zsailer), Kevin Goldsmith (@KevinGoldsmith).
+authors:  Fernando Pérez (@fperez), Sylvain Corlay (@SylvainCorlay), Afshin Darian (@afshin), Sharan Foga (@sharanf), Kevin Goldsmith (@KevinGoldsmith), Brian Granger (@ellisonbg) , Jason Grout (@jasongrout), Zach Sailer (@Zsailer), Jeremy Tuloup (@jtpio).
 issue-number: NN
 pr-number: NN
 date-started: 2021-11-12