Add a new environment in the Python docs markup: seealso*. This is similar

to seealso, but does not add the "See also:" header or put the content in a
box in the HTML version.

Updated the description of \seeurl to better indicate when it should be used;
the old description was written before we had \seetitle.

Doc/perl/python.perl

@@ -1725,6 +1725,12 @@ sub do_env_seealso{
             . '</div>');
 }
 
+sub do_env_seealsostar{
+    return ("<div class=\"seealso-simple\">\n  "
+            . @_[0]
+            . '</div>');
+}
+
 sub do_cmd_seemodule{
     # Insert the right magic to jump to the module definition.  This should
     # work most of the time, at least for repeat builds....