[DOC] Update core-devs list (#2976)

* Add Alexis to core-devs and fix alphabetical order

* Update AUTHORS.rst

Co-authored-by: bthirion <bertrand.thirion@inria.fr>

Co-authored-by: bthirion <bertrand.thirion@inria.fr>

AUTHORS.rst

@@ -21,17 +21,18 @@ Core developers
 The nilearn core developers are:
 
 * Alexandre Gramfort
+* Alexis Thual
 * Bertrand Thirion
+* Binh Nguyen
 * Elizabeth DuPre
 * Gael Varoquaux
 * Jerome Dockes
 * Julia Huntenburg
-* KamalakerDadi
+* Kamalaker Dadi
 * Kshitij Chawla
 * Nicolas Gensollen
-* Binh Nguyen
-* Thomas Bazeille
 * Taylor Salo
+* Thomas Bazeille
 
 Other contributors
 ..................