Slight formatting fix on list

doc/developer.html

@@ -34,7 +34,7 @@
     which means Moodle can use <a href="http://php.weblogs.com/ADOdb_manual#drivers">more 
     than ten different brands of database</a> (unfortunately, though, it can not 
     yet <em><strong>set up tables</strong></em> in all these databases - more 
-    on this later). <br>
+    on this later). <br><br>
   </li>
   <li><strong>Moodle should be easy to install, learn and modify</strong><br>
     <br>
@@ -49,7 +49,7 @@
     libraries of clearly-named functions and consistent layout of script files. 
     PHP is also easy to install (binaries are available for every platform) and 
     is widely available to the point that most web hosting services provide it 
-    as standard.<br>
+    as standard.<br><br>
   </li>
   <li><strong>It should be easy to upgrade from one version to the next</strong><br>
     <br>
@@ -57,14 +57,14 @@
     and a mechanism has been built-in so that Moodle can properly upgrade itself 
     to new versions (for example it can rename database tables or add new fields). 
     If using CVS in Unix for example, one can just do a &quot;cvs update -d&quot; 
-    and then visit the site home page to complete an upgrade.<br>
+    and then visit the site home page to complete an upgrade.<br><br>
   </li>
   <li><strong>It should be modular to allow for growth</strong><br>
     <br>
     Moodle has a number of features that are modular, including themes, activities, 
     interface languages, database schemas and course formats. This allows anyone 
     to add features to the main codebase or to even distribute them separately. 
-    More on this below in the next section.<br>
+    More on this below in the next section.<br><br>
   </li>
   <li><strong>It should be able to be used in conjunction with other systems</strong><br>
     <br>