DOC: re-word the whats new entry

tacaswell · tacaswell · commit 1a9f0a2bad6e · 2021-08-28T14:13:53.000-04:00
diff --git a/doc/users/next_whats_new/fig_draw_without_rendering.rst b/doc/users/next_whats_new/fig_draw_without_rendering.rst
@@ -1,10 +1,12 @@
-Figure now has draw_without_rendering method
---------------------------------------------
+Figure now has ``draw_without_rendering`` method
+------------------------------------------------
 
-Rarely, the user will want to trigger a draw without making output to
-either the screen or a file.  This is useful for determining the final
-position of artists on the figure that require a draw, like text artists.
-This could be accomplished via ``fig.canvas.draw()`` but has side effects,
-sometimes requires an open file, and is documented on an object most users
-do not need to access.  The `.Figure.draw_without_rendering` is provided to trigger
-a draw without pushing to the final output, and with fewer side effects.
+Rarely, the user will want to trigger a draw without rendering to either the
+screen or a file.  This is useful for determining the final position of artists
+on the figure that require a draw, like text artists, or resolve deferred
+computation like automatic data limits.  This can be done by
+``fig.canvas.draw()``, which forces a full draw and rendering, however this has
+side effects, sometimes requires an open file, and is doing more work than is
+needed.  The `.Figure.draw_without_rendering` method is provided to run the
+code in Matplotlib that updates values that are computed at draw-time and get
+accurate dimensions of the Artists more efficiently.
