Fixes typos

Co-authored-by: Mark "Murch" Erhardt <[email protected]>

Author: EthanHeilman

bip-0347.mediawiki

@@ -56,7 +56,7 @@ While the OP_SUCCESSx opcode upgrade path could enable us to increase the stack
 
 ==Backwards Compatibility==
 
-OP_CAT usage in an non-tapscript script will continue to trigger the SCRIPT_ERR_DISABLED_OPCODE. The only change would be to OP_CAT usage in tapscript. This change to tapscript would be activated a soft fork that redefines an OP_SUCCESSx opcode (OP_SUCCESS126) to OP_CAT.
+OP_CAT usage in a non-tapscript script will continue to trigger the SCRIPT_ERR_DISABLED_OPCODE. The only change would be to OP_CAT usage in tapscript. This change to tapscript would be activated as a soft fork that redefines an OP_SUCCESSx opcode (OP_SUCCESS126) to OP_CAT.
 
 ==Reference implementation==