doc: fixed formatting issue in cli docs

Removed some bad escape characters

PR-URL: https://github.com/nodejs/node/pull/13808
Fixes: https://github.com/nodejs/node/issues/13805
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>

doc/api/cli.md

@@ -512,7 +512,7 @@ added: v6.11.0
 
 Load an OpenSSL configuration file on startup. Among other uses, this can be
 used to enable FIPS-compliant crypto if Node.js is built with `./configure
-\-\-openssl\-fips`.
+--openssl-fips`.
 
 If the [`--openssl-config`][] command line option is used, the environment
 variable is ignored.