Correct silly typo

Author: pjkundert

README.org

@@ -175,7 +175,7 @@ to a USB drive for printing (or directly printed without the file being saved to
    : 2021-12-28 10:55:18 slip39           m/44'/60'/0'/0/0    : 0x68dD9B59D5dF605f4e9612E8b427Ab31187E2C54
    #+LATEX: }
 
-** Recovery Menonic Cards PDF
+** Recovery Mnemonic Cards PDF
 
    This is what the output SLIP-39 mnemonic cards PDF looks like: