Fix some user guide formatting

docs/fiv.html

@@ -64,8 +64,6 @@ adjusts the zoom level.
 <p>Files are iterated in the same order, and using the same filtering as in
 the browser.
 
-<p>
-
 <h2>File formats</h2>
 
 <p>The list of all supported file formats may be obtained by running:
@@ -74,7 +72,7 @@ the browser.
 fiv --list-supported-media-types
 </pre>
 
-Unless it has been turned off in your installation, you may extend it through
+<p>Unless it has been turned off in your installation, you may extend it through
 gdk-pixbuf modules.
 
 <h2>Thumbnails</h2>