Add deprecations to update docs for 6.0

doc/update/5.4-to-6.0.md

-# From 5.4 to 6.0
-
-### 0. Backup
-
-It's useful to make a backup just in case things go south:
-(With MySQL, this may require granting "LOCK TABLES" privileges to the GitLab user on the database version)
-
-```bash
-cd /home/git/gitlab
-sudo -u git -H RAILS_ENV=production bundle exec rake gitlab:backup:create
-```
-
-### 1. Stop server
-
-    sudo service gitlab stop
-
-### 2. Get latest code
-
-```bash
-cd /home/git/gitlab
-sudo -u git -H git fetch
-sudo -u git -H git checkout 6-0-dev
-```
-
-### 3. Install libs, migrations, etc.
-
-```bash
-cd /home/git/gitlab
-
-# MySQL
-sudo -u git -H bundle install --without development test postgres --deployment
-
-#PostgreSQL
-sudo -u git -H bundle install --without development test mysql --deployment
-
-sudo -u git -H bundle exec rake db:migrate RAILS_ENV=production
-sudo -u git -H bundle exec rake migrate_groups RAILS_ENV=production
-sudo -u git -H bundle exec rake migrate_global_projects RAILS_ENV=production
-sudo -u git -H bundle exec rake migrate_keys RAILS_ENV=production
-
-```
-
-### 4. Update config files
-
-* Make `/home/git/gitlab/config/gitlab.yml` same as https://github.com/gitlabhq/gitlabhq/blob/5-3-stable/config/gitlab.yml.example but with your settings.
-* Make `/home/git/gitlab/config/puma.rb` same as https://github.com/gitlabhq/gitlabhq/blob/5-3-stable/config/puma.rb.example but with your settings.
-
-### 5. Update Init script
-
-```bash
-sudo rm /etc/init.d/gitlab
-sudo curl --output /etc/init.d/gitlab https://raw.github.com/gitlabhq/gitlabhq/5-3-stable/lib/support/init.d/gitlab
-sudo chmod +x /etc/init.d/gitlab
-```
-
-### 6. Start application
-
-    sudo service gitlab start
-    sudo service nginx restart
-
-### 7. Check application status
-
-Check if GitLab and its environment are configured correctly:
-
-    sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production
-
-To make sure you didn't miss anything run a more thorough check with:
-
-    sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production
-
-If all items are green, then congratulations upgrade complete!
+# From 5.4 to 6.0
+
+### Deprecations
+
+#### Global projects
+
+We Derecated root(global) namespace for projects. 
+So you need to move all your global projects under group/users manually before update or it will be moved automatically to owner namespace during update.
+
+#### Teams
+
+We drop teams support as separate entity for 6.0 in favor of group membership.
+So now you will be able to manage group members in order to provide access to corresponding projects.
+
+
+### 0. Backup
+
+It's useful to make a backup just in case things go south:
+(With MySQL, this may require granting "LOCK TABLES" privileges to the GitLab user on the database version)
+
+```bash
+cd /home/git/gitlab
+sudo -u git -H RAILS_ENV=production bundle exec rake gitlab:backup:create
+```
+
+### 1. Stop server
+
+    sudo service gitlab stop
+
+### 2. Get latest code
+
+```bash
+cd /home/git/gitlab
+sudo -u git -H git fetch
+sudo -u git -H git checkout 6-0-dev
+```
+
+### 3. Install libs, migrations, etc.
+
+```bash
+cd /home/git/gitlab
+
+# MySQL
+sudo -u git -H bundle install --without development test postgres --deployment
+
+#PostgreSQL
+sudo -u git -H bundle install --without development test mysql --deployment
+
+sudo -u git -H bundle exec rake db:migrate RAILS_ENV=production
+sudo -u git -H bundle exec rake migrate_groups RAILS_ENV=production
+sudo -u git -H bundle exec rake migrate_global_projects RAILS_ENV=production
+sudo -u git -H bundle exec rake migrate_keys RAILS_ENV=production
+
+```
+
+### 4. Update config files
+
+* Make `/home/git/gitlab/config/gitlab.yml` same as https://github.com/gitlabhq/gitlabhq/blob/5-3-stable/config/gitlab.yml.example but with your settings.
+* Make `/home/git/gitlab/config/puma.rb` same as https://github.com/gitlabhq/gitlabhq/blob/5-3-stable/config/puma.rb.example but with your settings.
+
+### 5. Update Init script
+
+```bash
+sudo rm /etc/init.d/gitlab
+sudo curl --output /etc/init.d/gitlab https://raw.github.com/gitlabhq/gitlabhq/5-3-stable/lib/support/init.d/gitlab
+sudo chmod +x /etc/init.d/gitlab
+```
+
+### 6. Start application
+
+    sudo service gitlab start
+    sudo service nginx restart
+
+### 7. Check application status
+
+Check if GitLab and its environment are configured correctly:
+
+    sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production
+
+To make sure you didn't miss anything run a more thorough check with:
+
+    sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production
+
+If all items are green, then congratulations upgrade complete!
\ No newline at end of file