Move some new API changes to the correct place

Author: dstansby

doc/api/next_api_changes/2018-09-06-AL.rst

@@ -231,6 +231,10 @@ display units rather than in inches, which it previously did.
 The new behavior is the correct one given the uses of ``get_canvas_width_height``
 in the rest of the codebase.
 
+The pgf backend now includes images using ``\includegraphics`` instead of
+``\pgfimage`` if the version of ``graphicx`` is recent enough to support the
+``interpolate`` option (this is detected automatically).
+
 `~matplotlib.cbook`
 ~~~~~~~~~~~~~~~~~~~
 The default value of the "obj_type" parameter to ``cbook.warn_deprecated`` has
@@ -260,4 +264,3 @@ package, and Axes methods that take a ``norm`` parameter.
 
 If extra kwargs are passed to `.LogScale`, `TypeError` will now be
 raised instead of `ValueError`.
-

doc/api/next_api_changes/2019-08-28-AL.rst

@@ -139,6 +139,11 @@ Passing scalars to parameter *where* in ``fill_between()`` and
 broadcasted to the size of *x*. Non-matching sizes will raise a ``ValueError``
 in the future.
 
+``tight_layout()``
+~~~~~~~~~~~~~~~~~~
+The ``renderer`` parameter to `.Figure.tight_layout` is deprecated; this method
+now always uses the renderer instance cached on the `.Figure`.
+
 rcParams
 ~~~~~~~~
 The ``rcsetup.validate_animation_writer_path`` function is deprecated.
@@ -178,6 +183,8 @@ PGF
 ``backend_pgf.repl_escapetext`` and ``backend_pgf.repl_mathdefault`` are
 deprecated.
 
+``RendererPgf.latexManager`` is deprecated.
+
 FigureCanvas
 ~~~~~~~~~~~~
 ``FigureCanvasBase.draw_cursor`` (which has never done anything and has never
@@ -269,5 +276,3 @@ from the public API in future versions.
 
 ``style.core.is_style_file`` and ``style.core.iter_style_files``
 are deprecated.
-
-