add default search image and location for poor bradford

docs/user_guide/searching/default_pages.rst

@@ -3,3 +3,10 @@ Tripal Content-Specific Search Tools
 
 
 By default, Tripal will provide a search tool for every Tripal content type.  When a new content type is created, a new search tool is automatically created for that tool.
+
+These search tools will be available at ``/data_search/[content label]``, such as ``/data_search/mrna``.
+
+.. figure:: ./default_pages.1.png
+  :alt: An example mRNA search
+
+  An example search with the default mRNA content type.  Results are sortable by clicking the column name.