Switch positions of source and directory sections

Updated the documentation to match the updated order including
the screenshot.

app/views/projects/buttons/_download.html.haml

@@ -8,7 +8,19 @@
       %span.sr-only=  _('Select Archive Format')
       = sprite_icon("arrow-down")
     %ul.dropdown-menu.dropdown-menu-right{ role: 'menu' }
+      %li.dropdown-bold-header= _('Download source code')
+      %li.dropdown-menu-content
+        %ul
+          %li.inline-content
+            = link_to _('zip'), project_archive_path(project, id: tree_join(ref, archive_prefix), format: 'zip'), rel: 'nofollow', download: '', class: 'btn btn-primary btn-xs'
+          %li.inline-content
+            = link_to _('tar.gz'), project_archive_path(project, id: tree_join(ref, archive_prefix), format: 'tar.gz'), rel: 'nofollow', download: '', class: 'btn btn-xs'
+          %li.inline-content
+            = link_to _('tar.bz2'), project_archive_path(project, id: tree_join(ref, archive_prefix), format: 'tar.bz2'), rel: 'nofollow', download: '', class: 'btn btn-xs'
+          %li.inline-content
+            = link_to _('tar'), project_archive_path(project, id: tree_join(ref, archive_prefix), format: 'tar'), rel: 'nofollow', download: '', class: 'btn btn-xs'
       - if directory?
+        %li.separator
         %li.dropdown-bold-header= _('Download this directory')
         %li.dropdown-menu-content
           %ul
@@ -20,18 +32,6 @@
               = link_to _('tar.bz2'), project_archive_path(project, id: tree_join(ref, archive_prefix), path: @path, format: 'tar.bz2'), rel: 'nofollow', download: '', class: 'btn btn-xs'
             %li.inline-content
               = link_to _('tar'), project_archive_path(project, id: tree_join(ref, archive_prefix), path: @path, format: 'tar'), rel: 'nofollow', download: '', class: 'btn btn-xs'
-        %li.separator
-      %li.dropdown-bold-header= _('Download source code')
-      %li.dropdown-menu-content
-        %ul
-          %li.inline-content
-            = link_to _('zip'), project_archive_path(project, id: tree_join(ref, archive_prefix), format: 'zip'), rel: 'nofollow', download: '', class: 'btn btn-primary btn-xs'
-          %li.inline-content
-            = link_to _('tar.gz'), project_archive_path(project, id: tree_join(ref, archive_prefix), format: 'tar.gz'), rel: 'nofollow', download: '', class: 'btn btn-xs'
-          %li.inline-content
-            = link_to _('tar.bz2'), project_archive_path(project, id: tree_join(ref, archive_prefix), format: 'tar.bz2'), rel: 'nofollow', download: '', class: 'btn btn-xs'
-          %li.inline-content
-            = link_to _('tar'), project_archive_path(project, id: tree_join(ref, archive_prefix), format: 'tar'), rel: 'nofollow', download: '', class: 'btn btn-xs'
       - if pipeline && pipeline.latest_builds_with_artifacts.any?
         %li.separator
         %li.dropdown-bold-header= _('Download artifacts')

doc/user/project/repository/index.md

@@ -249,15 +249,15 @@ By clicking the download icon, a dropdown will open with links to download the f
 
 ![Download source code](img/download_source_code.png)
 
+- **Source Code:**
+  This allows users to download the source code on branch they're currently
+  viewing. Available zip, tar, tar.gz and tar.bz2.
 - **Directory:**
   > [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/issues/24704) in GitLab 11.10
 
   Only shows up when viewing a sub-directory. This allows users to download
-  the specific directory they're currently viewing. Available in zip, tar, tar.gz
-  and tar.bz2.
-- **Source Code:**
-  This allows users to download the source code on branch they're currently
-  viewing. Also available zip, tar, tar.gz and tar.bz2.
+  the specific directory they're currently viewing. Also available in zip, tar,
+  tar.gz and tar.bz2.
 - **Artifacts:**
   This allows users to download the artifacts of the latest CI build.