DOC: make sure mosaic is in the title for ctrl-f searching

Author: tacaswell

examples/subplots_axes_and_figures/mosaic.py

@@ -1,11 +1,12 @@
 """
 .. redirect-from:: /tutorials/provisional/mosaic
 
-=======================================
-Complex and semantic figure composition
-=======================================
 
 
+========================================================
+Complex and semantic figure composition (subplot_mosaic)
+========================================================
+
 Laying out Axes in a Figure in a non-uniform grid can be both tedious
 and verbose.  For dense, even grids we have `.Figure.subplots` but for
 more complex layouts, such as Axes that span multiple columns / rows