DOC: fix word choice and markup

Co-authored-by: Ruth Comer <[email protected]>

Author: tacaswell

lib/matplotlib/figure.py

@@ -1870,7 +1870,7 @@ def subplot_mosaic(self, mosaic, *, sharex=False, sharey=False,
             values in *per_subplot_kw*.
 
         per_subplot_kw : dict, optional
-            A dictionary mapping the Axes idenitfies or tuples of identifies to
+            A dictionary mapping the Axes identifiers or tuples of identifiers to
             a dictionary of keyword arguments to be passed to the
             `.Figure.add_subplot` call used to create each subplot.  The values
             in these dictionaries have precedence over the values in

tutorials/provisional/mosaic.py

@@ -280,7 +280,7 @@ def identify_axes(ax_dict, fontsize=48):
 ###############################################################################
 # Controlling subplot creation
 # ============================
-
+#
 # We can also pass through arguments used to create the subplots
 # (again, the same as `.Figure.subplots`) which will apply to all
 # of the Axes created.