Fix rst links

Author: dstansby

doc/users/prev_whats_new/whats_new_0.98.4.rst

@@ -79,7 +79,7 @@ psd amplitude scaling
 
 Ryan May did a lot of work to rationalize the amplitude scaling of
 :func:`~matplotlib.pyplot.psd` and friends.  See
-:ref:`sphx_glr_gallery_pylab_examples_psd_demo.py`.
+:ref:`sphx_glr_gallery_lines_bars_and_markers_psd_demo.py`.
 The changes should increase MATLAB
 compatibility and increase scaling options.
 
@@ -298,6 +298,3 @@ Here are the 0.98.4 notes from the CHANGELOG::
 
     Added support for arbitrary rasterization resolutions to the SVG
     backend. - MW
-
-
-

doc/users/prev_whats_new/whats_new_0.99.rst

@@ -65,7 +65,7 @@ that denote the data limits -- in various arbitrary locations.  No
 longer are your axis lines constrained to be a simple rectangle around
 the figure -- you can turn on or off left, bottom, right and top, as
 well as "detach" the spine to offset it away from the data.  See
-:ref:`sphx_glr_gallery_pylab_examples_spine_placement_demo.py` and
+:ref:`sphx_glr_gallery_ticks_and_spines_spine_placement_demo.py` and
 :class:`matplotlib.spines.Spine`.
 
 .. figure:: ../../gallery/pyplots/images/sphx_glr_whats_new_99_spines_001.png
@@ -74,7 +74,3 @@ well as "detach" the spine to offset it away from the data.  See
    :scale: 50
 
    Whats New 99 Spines
-
-
-
-

doc/users/prev_whats_new/whats_new_1.3.rst

@@ -154,8 +154,8 @@ Till Stensitzki added non-zero baselines to
 :func:`~matplotlib.pyplot.stackplot`.  They may be symmetric or
 weighted.
 
-.. figure:: ../../gallery/pylab_examples/images/sphx_glr_stackplot_demo_001.png
-   :target: ../../gallery/pylab_examples/stackplot_demo.html
+.. figure:: ../../gallery/lines_bars_and_markers/images/sphx_glr_stackplot_demo_001.png
+   :target: ../../gallery/lines_bars_and_markers/stackplot_demo.html
    :align: center
    :scale: 50