update kelfbinder warning

Author: saildot4k

docs/exploits/kelfbinder-tutorial.md

@@ -10,6 +10,11 @@ KelfBinder and OpenTuna Installers
 
     It is wise to have an empty/spare memory card to install these exploits onto. Otherwise the install may fail. KelfBinder and OpenTuna Installer attempts to delete any pre-existing setup that may conflict first, but it cannot predict how you setup/purchsed your memory card that you are installing onto.
 
+    !!! danger "Installing to your one and only exploit card!"
+
+        If install fails, you may be left without a working exploit IE no way to access homebrew. __YOU HAVE BEEN WARNED!!!__  
+        For example, multi region, multi console installs of FMCB MUST BE REMOVED with the FMCB uninstaller. Doing so by simple deletion WILL CAUSE memory card corruption due to how it handles this sadly un-unique situation that many shitty chinese FMCB cards come installed with!
+
 
 ## KelfBinder