Make Issue boards importable

- Added space to li definiton
- Remove milestone from import_export.yml

app/views/projects/_export.html.haml

@@ -15,7 +15,7 @@
         %li= _('Project configuration, including services')
         %li= _('Issues with comments, merge requests with diffs and comments, labels, milestones, snippets, and other project entities')
         %li= _('LFS objects')
-        %li=_('Issue Boards')
+        %li= _('Issue Boards')
       %p= _('The following items will NOT be exported:')
       %ul
         %li= _('Job traces and artifacts')

lib/gitlab/import_export/import_export.yml

@@ -84,9 +84,6 @@ project_tree:
     - lists:
       - label:
         - :priorities
-      - milestone:
-        - events:
-          - :push_event_payload
 
 # Only include the following attributes for the models specified.
 included_attributes: