DOC: raw string is too blunt an instrument

We need the \n un-escaped

Co-authored-by: Oscar Gustafsson <[email protected]>

Author: tacaswell

doc/users/prev_whats_new/whats_new_3.3.0.rst

@@ -373,8 +373,8 @@ set with the new rcParameter :rc:`axes.titley`.
 .. plot::
 
     fig, axs = plt.subplots(1, 2, constrained_layout=True, figsize=(5, 2))
-    axs[0].set_title(r'y=0.7\n$\sum_{j_n} x_j$', y=0.7)
-    axs[1].set_title(r'y=None\n$\sum_{j_n} x_j$')
+    axs[0].set_title('y=0.7\n$\\sum_{j_n} x_j$', y=0.7)
+    axs[1].set_title('y=None\n$\\sum_{j_n} x_j$')
     plt.show()
 
 Offset text is now set to the top when using ``axis.tick_top()``