Update doc/about.rst

Co-authored-by: Tim Head <[email protected]>

Author: francoisgoupil

doc/about.rst

@@ -184,7 +184,7 @@ The project would like to thank the following funders.
 
   .. div:: text-box
 
-    `:probabl. <https://probabl.ai>`_ is managing the whole sponsorship program
+    `:probabl. <https://probabl.ai>`_ manages the whole sponsorship program
     and employs the full-time core maintainers Adrin Jalali, Arturo Amor,
     François Goupil, Guillaume Lemaitre, Jérémie du Boisberranger, Loïc Estève,
     Olivier Grisel, and Stefanie Senger.