Minor adjustment

Signed-off-by: Astro-Kirsty <AstroKirsty@gmail.com>

contribute.html

@@ -97,9 +97,9 @@ <h1>Contribute</h1>
 
         <p> As developer, we can also contribute by presenting your activities into conferences, by making tutorial presenting recipies or by animating a Gammapy school or hands-on session. The list of contributions by type is given in the following list:
            <ul>
-             <li><a href="https://github.com/gammapy/gammapy-presentations">conferences</a>, </li>
-             <li><a href="https://github.com/gammapy/gammapy-recipes">recipies</a>, </li>
-             <li><a href="https://github.com/gammapy/gammapy-handson">hands-on sessions and schools</a>. </li>
+             <li><a href="https://github.com/gammapy/gammapy-presentations">Conferences</a> </li>
+             <li><a href="https://github.com/gammapy/gammapy-recipes">Recipes</a> </li>
+             <li><a href="https://github.com/gammapy/gammapy-handson">Hands-on sessions and schools</a> </li>
            </ul>
         </p>
     </div>