Updated FAQ (markdown)

FAQ.md

@@ -660,33 +660,26 @@ User: I got this.
 
 <img width="858" height="484" alt="a52c9725-6867-4652-8704-138f72d566f5" src="https://github.com/user-attachments/assets/a3c07e3e-5d37-4e09-b5f7-c42b5a9dd9ac" />
 
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 RustDesk: In the developer tools console, the error logs indicate that the Content Security Policy (CSP) is blocking the loading of Base64 images. We can also see in the Network panel that the Base64 images fail to load. Could you please confirm if there have been any recent changes to the site's Content-Security-Policy settings?
 
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 Also, could you clarify what proxy software is being used—is it Nginx? If possible, could we take a look at the RustDesk website’s Nginx configuration?
 
 User: we found the rule that blocked the images in Nginx.
 
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 The following rule blocked the Images:
 
+```
 add_header Content-Security-Policy "img-src 'self';connect-src 'self'; frame-ancestors 'self'; block-all-mixed-content; upgrade-insecure-requests;" always;
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+```
 
 We have added some new rules in January, to improve the security of our hosted websites.
 
 This rule was one of them.
 
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 Your reference to Nginx brought it to our attention.
 
 We weren't aware that the changes had an impact on rustdesk, as everything else was running normally.
 
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 # Connection Log or device name on devices page of web console is empty
 Actually it is the same problem as above, [set correct `API` (the same as web console address)](https://github.com/rustdesk/rustdesk/wiki/FAQ#failed-to-log-in-with-custom-client-build-or-public-release-with-wrong-api-settings), you have wrong API settings.