added reference

For exporting, setting the view size is extremely useful...

source/Paraview/Export/export-animation/index.rst

@@ -6,6 +6,9 @@ Export an animation
 .. note::
    This document is part of a series teaching how to :ref:`create-image-sea-surface-speeds`
 
+.. note::
+   Before you export to any format, you might want to :ref:`set-view-size`.
+
 
 .. warning::
    Before you start exporting :ref:`save-state`. Things can go wrong and often you want to reproduce a saved animation (with small changes).

source/Paraview/Export/index.rst

@@ -5,6 +5,8 @@
 
 Export
 ===================================================
+.. note::
+   Before you export to any format, you might want to :ref:`set-view-size`.
 
 .. toctree::
    :maxdepth: 2