Update documentation referring to icon class names

docs/extending/adding_reports.md

@@ -167,7 +167,7 @@ from .views import UnpublishedChangesReportView
 
 @hooks.register('register_reports_menu_item')
 def register_unpublished_changes_report_menu_item():
-    return AdminOnlyMenuItem("Pages with unpublished changes", reverse('unpublished_changes_report'), classnames='icon icon-' + UnpublishedChangesReportView.header_icon, order=700)
+    return AdminOnlyMenuItem("Pages with unpublished changes", reverse('unpublished_changes_report'), icon_name=UnpublishedChangesReportView.header_icon, order=700)
 
 @hooks.register('register_admin_urls')
 def register_unpublished_changes_report_url():
@@ -230,7 +230,7 @@ from .views import UnpublishedChangesReportView
 
 @hooks.register('register_reports_menu_item')
 def register_unpublished_changes_report_menu_item():
-    return AdminOnlyMenuItem("Pages with unpublished changes", reverse('unpublished_changes_report'), classnames='icon icon-' + UnpublishedChangesReportView.header_icon, order=700)
+    return AdminOnlyMenuItem("Pages with unpublished changes", reverse('unpublished_changes_report'), icon_name=UnpublishedChangesReportView.header_icon, order=700)
 
 @hooks.register('register_admin_urls')
 def register_unpublished_changes_report_url():

docs/reference/hooks.md

@@ -842,7 +842,7 @@ from wagtail import hooks
 class UserbarPuppyLinkItem:
     def render(self, request):
         return '<li><a href="http://cuteoverload.com/tag/puppehs/" ' \
-            + 'target="_parent" role="menuitem" class="action icon icon-wagtail">Puppies!</a></li>'
+            + 'target="_parent" role="menuitem" class="action">Puppies!</a></li>'
 
 @hooks.register('construct_wagtail_userbar')
 def add_puppy_link_item(request, items):