fix style

content/self-host/rustdesk-server-pro/license/_index.en.md

@@ -3,13 +3,13 @@ title: License
 weight: 15
 ---
 
-### Buy license
+## Buy license
 
 Please get your license from [https://rustdesk.com/pricing.html](https://rustdesk.com/pricing.html), enter a valid email address in the Stripe checkout page. The license (and the invoice in a separate mail) will be sent to your email once payment is done successfully.
 
 ![](/docs/en/self-host/rustdesk-server-pro/license/images/stripe.jpg)
 
-### Set license
+## Set license
 
 You will be required to enter license in the web console (`http://<rustdesk-server-pro-ip>:21114`), or change license later.
 
@@ -17,7 +17,7 @@ You will be required to enter license in the web console (`http://<rustdesk-serv
 | --- | --- |
 | ![](/docs/en/self-host/rustdesk-server-pro/license/images/set.png) | ![](/docs/en/self-host/rustdesk-server-pro/license/images/change.png) |
 
-### Renew/upgrade license
+## Renew/upgrade license
 
 Renew/upgrade license can be found via the [self-service license portal](https://rustdesk.com/self-host/account/) as described below, log in with the email you used to buy the license as above picture.
 
@@ -27,18 +27,18 @@ Renew/upgrade license can be found via the [self-service license portal](https:/
 
 After making the payment, please refresh the license [as below](/docs/en/self-host/rustdesk-server-pro/license/#refresh-license) to activate it.
 
-#### Refresh license
+### Refresh license
 After payment, you need to proceed to the web console to activate it manually as below. Just click on `Edit`, then `OK`, no need to edit anything, because your license key remains the same.
 
 ![](/docs/en/self-host/rustdesk-server-pro/license/images/updatelic.jpg)
 
-### Invoices, License Retrieval and Migration
+## Invoices, License Retrieval and Migration
 
 The license can be only used on one machine (for hbbs only, hbbr does not require license), if you want to migrate to the other machine, retrieve your license or download invoices, please go to [https://rustdesk.com/self-host/account/](https://rustdesk.com/self-host/account/). Log in with the email address used for Stripe checkout, unbind the old machine you want to migrate from as below, when you set the license in the new servers web console it will assign the license and register automatically in the console.
 
 ![](/docs/en/self-host/rustdesk-server-pro/license/images/unbind.jpg)
 
-### Proxy
+## Proxy
 If your server can not access internet to verify license directly, you can add proxy, e.g. `proxy=http://username:password@example.com:8080 ./hbbs`.
 
 Alternatively, you can add `proxy=http://username:password@example.com:8080` to `.env` file under working directory (where `id_ed25519` / `db.sqlite3` files reside).