changes as per discussion in #25 (review)

Author: Luisa Rebull

html/firefly/catalogs.html

@@ -340,7 +340,7 @@ <h3><a name="owncatalogs">Loading your own catalogs from disk</A></h3><P>
 href="visualization.html#catalogload">this section</A>.<P>
 
 <DT><strong>Region files (*reg)</strong>
-<DD>Region files are plain text overlays originally used in<a
+<DD>Region files are plain text overlays originally used in <a
 href="http://ds9.si.edu/doc/ref/region.html" target="_blank">ds9 <img
 src="img/jumpout.jpg" height="10"></A>. Regions files can be overlaid
 on images (see <a href="visualization.html#ds9regions">here</A>), but
@@ -749,8 +749,8 @@ <h3><A name="interacting">Interacting with catalogs</A></h3>
 can plot columns from your catalog, including simple mathematical
 manipulations of catalog columns.<P>
 
-If your catalog has positions included and your tool has an image
-display, your catalog will also be overlaid on an image. The <a
+If the catalog has positions included and the tool has an image
+display, the catalog will also be overlaid on an image. The <a
 href="visualization.html">Visualization section</A> includes
 information about that. Each catalog that you load is overlaid on
 the image using different, customizable symbols and colors. <P>