fix NumFOCUS acknowledgement

Author: jimustafa

handout-beginner.tex

@@ -300,7 +300,7 @@ \subsection*{\rmfamily Save \mdseries (bitmap or vector format)}
   Matplotlib 3.4.2 handout for beginners.
   Copyright (c) 2021 Matplotlib Development Team.
   Released under a CC-BY 4.0 International License.
-  Supported by NumFocus Grant \#12345.
+  Supported by NumFOCUS.
 \par}
 
 \end{multicols*}

handout-intermediate.tex

@@ -201,7 +201,7 @@ \subsection*{\rmfamily Size \& DPI}
   Matplotlib 3.4.2 handout for intermediate users.
   Copyright (c) 2021 Matplotlib Development Team.
   Released under a CC-BY 4.0 International License.
-  Supported by NumFocus Grant \#12345.
+  Supported by NumFOCUS.
 \par}
 
 

handout-tips.tex

@@ -246,7 +246,7 @@ \subsection*{\rmfamily Read the documentation}
   Matplotlib 3.4.2 handout for tips \& tricks.
   Copyright (c) 2021 Matplotlib Development Team.
   Released under a CC-BY 4.0 International License.
-  Supported by NumFocus Grant \#12345.
+  Supported by NumFOCUS.
 \par}