Merge pull request matplotlib#28255 from meeseeksmachine/auto-backport-of-pr-28254-on-v3.9.x

Backport PR matplotlib#28254 on branch v3.9.x ([DOC] plot type heading consistency)

Author: QuLogic

galleries/plot_types/arrays/README.rst

@@ -1,7 +1,7 @@
 .. _array_plots:
 
-Gridded data:
--------------
+Gridded data
+------------
 
 Plots of arrays and images :math:`Z_{i, j}` and fields :math:`U_{i, j}, V_{i, j}`
 on `regular grids <https://en.wikipedia.org/wiki/Regular_grid>`_ and