api-builder: remove annotation block from directive docs

tools/api-builder/angular.io-package/templates/class.template.html

@@ -24,6 +24,7 @@ p.location-badge.
 {% block additional %}
 {% endblock %}
 
+{% block annotations %}
 {%- if doc.decorators.length %}
 .l-main-section
   h2 Annotations
@@ -33,6 +34,8 @@ p.location-badge.
       pre.prettyprint
         code.
           @{$ decorator.name $}{$ paramList(decorator.arguments) | indent(10, false) $}{% endfor %}{% endif %}
+{% endblock %}
+
 {% if doc.constructorDoc or doc.members.length -%}
 .l-main-section
   h2 Members

tools/api-builder/angular.io-package/templates/directive.template.html

@@ -2,6 +2,10 @@
 {% include "lib/paramList.html" -%}
 {% extends 'class.template.html' -%}
 
+{% block annotations %}
+{% endblock %}
+
+
 {% block additional -%}
 .l-main-section
   h2 Selectors