Fix HTML tags in bootloader.md

Author: shomykohai

docs/dev/bootloader.md

@@ -33,8 +33,8 @@ Thanks to [**@cxzstuff**](https://github.com/cxzstuff) for making it.
 :::
 <iframe width="100%" height="500" src="https://www.youtube-nocookie.com/embed/EGY1_JjN9hU" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
 
-0. MAKE SURE YOU HAVE THE SAME ANDROID VERSION ON BOTH SLOTS!!</br>
-    Otherwise, you might risk hard bricking the phone.</br>
+0. MAKE SURE YOU HAVE THE SAME ANDROID VERSION ON BOTH SLOTS!!<br/>
+    Otherwise, you might risk hard bricking the phone.<br/>
     We suggest flashing stock firmware BEFORE unlocking the bootloader (with SP Flash Tool), to reduce the risks of hardbricking
     when switching slots. **DO NOT SKIP THIS STEP**
 1. Enable "OEM Unlocking" in developer settings