CHANGELOG: fix mctp-bench typo

Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>

Author: jk-ozlabs

CHANGELOG.md

@@ -35,7 +35,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
    where the reported endpoint EID may either be different from expected,
    or invalid
 
-6. New debug/test tool, `mctp-becnh`, for performing basic requests to MCTP
+6. New debug/test tool, `mctp-bench`, for performing basic requests to MCTP
    endpoints, and printing their responses
 
 ### Changed