Summary:
Description of ysql_yb_enable_ash still says to enable ysql_yb_ash_enable_infra which is deprecated.
This diff fixes that.
Jira: DB-16237

Test Plan: Jenkins

Reviewers: ishan.chhangani

Reviewed By: ishan.chhangani

Subscribers: yql

Differential Revision: https://phorge.dev.yugabyte.com/D43246