Add Requirements to rst template, ansible-doc

tweak position & look of Requirements in rst
tweak APT's notes as per anhj's wish

hacking/templates/rst.j2

@@ -42,6 +42,18 @@
     </table>
 {% endif %}
 
+{% if requirements %}
+.. raw:: html
+
+    <p>
+    <b>Requirements:</b> 
+    {% for req in requirements %}
+    @{ req | html_ify }@
+    {% endfor %}
+    </p>
+
+{% endif %}
+
 .. raw:: html
 
 {% for example in examples %}
@@ -62,6 +74,7 @@
     </pre>
 {% endif %}
 
+
 {% if notes %}
 .. raw:: html