Merge branch 'update_guides' into 'master'

Remove outdated notes from the update guide

## What does this MR do?

updates guides

See merge request !5624

doc/update/8.10-to-8.11.md

@@ -62,23 +62,7 @@ sudo -u git -H git checkout v0.7.8
 sudo -u git -H make
 ```
 
-### 6. Update MySQL permissions
-
-If you are using MySQL you need to grant the GitLab user the necessary
-permissions on the database:
-
-```bash
-# Login to MySQL
-mysql -u root -p
-
-# Grant the GitLab user the REFERENCES permission on the database
-GRANT REFERENCES ON `gitlabhq_production`.* TO 'git'@'localhost';
-
-# Quit the database session
-mysql> \q
-```
-
-### 7. Install libs, migrations, etc.
+### 6. Install libs, migrations, etc.
 
 ```bash
 cd /home/git/gitlab
@@ -100,7 +84,7 @@ sudo -u git -H bundle exec rake assets:clean assets:precompile cache:clear RAILS
 
 ```
 
-### 8. Update configuration files
+### 7. Update configuration files
 
 #### New configuration options for `gitlab.yml`
 
@@ -110,14 +94,6 @@ There are new configuration options available for [`gitlab.yml`](config/gitlab.y
 git diff origin/8-10-stable:config/gitlab.yml.example origin/8-11-stable:config/gitlab.yml.example
 ```
 
-#### Git configuration
-
-Disable `git gc --auto` because GitLab runs `git gc` for us already.
-
-```sh
-sudo -u git -H git config --global gc.auto 0
-```
-
 #### Nginx configuration
 
 Ensure you're still up-to-date with the latest NGINX configuration changes:
@@ -157,12 +133,12 @@ Ensure you're still up-to-date with the latest init script changes:
 
     sudo cp lib/support/init.d/gitlab /etc/init.d/gitlab
 
-### 9. Start application
+### 8. Start application
 
     sudo service gitlab start
     sudo service nginx restart
 
-### 10. Check application status
+### 9. Check application status
 
 Check if GitLab and its environment are configured correctly: