Improve project manifest import docs

doc/user/project/import/index.md

@@ -11,7 +11,7 @@
 1. [From SVN](svn.md)
 1. [From TFS](tfs.md)
 1. [From repo by URL](repo_by_url.md)
-1. [By uploading a manifest file](manifest.md)
+1. [By uploading a manifest file (AOSP)](manifest.md)
 
 In addition to the specific migration documentation above, you can import any
 Git repository via HTTP from the New Project page. Be aware that if the

doc/user/project/import/manifest.md

 # Import multiple repositories by uploading a manifest file
 
-GitLab allows you to import all the required git repositories 
-based a manifest file like the one used by the [Android repository](https://android.googlesource.com/platform/manifest/+/2d6f081a3b05d8ef7a2b1b52b0d536b2b74feab4/default.xml).
-This feature can be very handy when you need to import a project with many repositories like Android Open Source Project (AOSP).
+GitLab allows you to import all the required Git repositories
+based on a manifest file like the one used by the
+[Android repository](https://android.googlesource.com/platform/manifest/+/2d6f081a3b05d8ef7a2b1b52b0d536b2b74feab4/default.xml).
+This feature can be very handy when you need to import a project with many
+repositories like the Android Open Source Project (AOSP).
 
+## Requirements
 
->**Note:** 
-This feature requires [subgroups](../../group/subgroups/index.md) to be supported by your database. 
+GitLab must be using PostgreSQL for its database, since
+[subgroups](../../group/subgroups/index.md) are needed for the manifest import
+to work.
 
-You can do it by following next steps: 
+Read more about the [database requirements](../../../install/requirements.md#database).
 
-1. From your GitLab dashboard click **New project**
-1. Switch to the **Import project** tab
-1. Click on the **Manifest file** button
-1. Provide GitLab with a manifest xml file
-1. Select a group you want to import to (you need to create a group first if you don't have one)
-1. Click **List available repositories** 
-1. You will be redirected to the import status page with projects list based on manifest file
-1. Check the list and click 'Import all repositories' to start import.
+## Manifest format
 
-![Manifest upload](img/manifest_upload.png)
+A manifest must be an XML file. There must be one `remote` tag with a `review`
+attribute that contains a URL to a Git server, and each `project` tag must have
+a `name` and `path` attribute. GitLab will then build the URL to the repository
+by combining the URL from the `remote` tag with a project name.
+A path attribute will be used to represent the project path in GitLab.
 
-![Manifest status](img/manifest_status.png)
-
-### Manifest format
-
-A manifest must be an XML file. There must be one `remote` tag with `review` attribute
-that contains a URL to a git server. Each `project` tag must have `name` and `path` attribute. 
-GitLab will build URL to the repository by combining URL from `remote` tag with a project name.
-A path attribute will be used to represent project path in GitLab system. 
-
-Below is a valid example of manifest file.
+Below is a valid example of a manifest file:
 
 ```xml
 <manifest>
@@ -41,9 +33,24 @@ Below is a valid example of manifest file.
 </manifest>
 ```
 
-As result next projects will be created: 
+As a result, the following projects will be created:
 
 | GitLab | Import URL |
 |---|---|
-| https://gitlab/YOUR_GROUP/build/make | https://android-review.googlesource.com/platform/build | 
-| https://gitlab/YOUR_GROUP/build/blueprint | https://android-review.googlesource.com/platform/build/blueprint | 
+| https://gitlab.com/YOUR_GROUP/build/make | https://android-review.googlesource.com/platform/build |
+| https://gitlab.com/YOUR_GROUP/build/blueprint | https://android-review.googlesource.com/platform/build/blueprint |
+
+## Importing the repositories
+
+You can start the import with:
+
+1. From your GitLab dashboard click **New project**
+1. Switch to the **Import project** tab
+1. Click on the **Manifest file** button
+1. Provide GitLab with a manifest xml file
+1. Select a group you want to import to (you need to create a group first if you don't have one)
+1. Click **List available repositories**. At this point, you will be redirected
+   to the import status page with projects list based on the manifest file.
+1. Check the list and click **Import all repositories** to start the import.
+
+    ![Manifest status](img/manifest_status.png)