## Description
Fix step 1 of the [Database Preparation](https://docs.gitea.com/installation/database-prep) docs.
## Changes
When a user modifies the */etc/mysql/my.cnf* config file as instructed in step 1 of the database preparation guide, they get an error message from MySQL when trying to log in as the root user after saving changes.
```shell
mysql: [ERROR] Found option without preceding group in config file /etc/mysql/my.cnf at line 37.
mysql: [ERROR] Fatal error in defaults handling. Program aborted!
```
The solution is to include precede `bind-address` with a group like this.
```ini
[mysqld]
bind-address = 203.0.113.3
```
Reviewed-on: https://gitea.com/gitea/docs/pulls/173
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: b-nagaj <bryce.nagaj@proton.me>
Co-committed-by: b-nagaj <bryce.nagaj@proton.me>
