Fix order of steps to prevent PostgreSQL errors when running migration [ci skip]

doc/update/8.5-to-8.6.md

@@ -62,7 +62,26 @@ sudo -u git -H git checkout v0.7.1
 sudo -u git -H make
 ```
 
-### 6. Install libs, migrations, etc.
+### 6. Updates for PostgreSQL Users
+
+Starting with 8.6 users using GitLab in combination with PostgreSQL are required
+to have the `pg_trgm` extension enabled for all GitLab databases. If you're
+using GitLab's Omnibus packages there's nothing you'll need to do manually as
+this extension is enabled automatically. Users who install GitLab without using
+Omnibus (e.g. by building from source) have to enable this extension manually.
+To enable this extension run the following SQL command as a PostgreSQL super
+user for _every_ GitLab database:
+
+```sql
+CREATE EXTENSION IF NOT EXISTS pg_trgm;
+```
+
+Certain operating systems might require the installation of extra packages for
+this extension to be available. For example, users using Ubuntu will have to
+install the `postgresql-contrib` package in order for this extension to be
+available.
+
+### 7. Install libs, migrations, etc.
 
 ```bash
 cd /home/git/gitlab
@@ -84,7 +103,7 @@ sudo -u git -H bundle exec rake assets:clean assets:precompile cache:clear RAILS
 
 ```
 
-### 7. Update configuration files
+### 8. Update configuration files
 
 #### New configuration options for `gitlab.yml`
 
@@ -120,25 +139,6 @@ Ensure you're still up-to-date with the latest init script changes:
 
     sudo cp lib/support/init.d/gitlab /etc/init.d/gitlab
 
-### 8. Updates for PostgreSQL Users
-
-Starting with 8.6 users using GitLab in combination with PostgreSQL are required
-to have the `pg_trgm` extension enabled for all GitLab databases. If you're
-using GitLab's Omnibus packages there's nothing you'll need to do manually as
-this extension is enabled automatically. Users who install GitLab without using
-Omnibus (e.g. by building from source) have to enable this extension manually.
-To enable this extension run the following SQL command as a PostgreSQL super
-user for _every_ GitLab database:
-
-```sql
-CREATE EXTENSION IF NOT EXISTS pg_trgm;
-```
-
-Certain operating systems might require the installation of extra packages for
-this extension to be available. For example, users using Ubuntu will have to
-install the `postgresql-contrib` package in order for this extension to be
-available.
-
 ### 9. Start application
 
     sudo service gitlab start