[Doc] Refine the README for feedback_management

[joshuayao]

Priority

P1-Stopper

OS type

Ubuntu

Hardware type

Xeon-GNR

Running nodes

Single Node

Description

Please read the guidelines in #1398.

If this task deprecates the component in v1.4, we can skip this task.

[CICD-at-OPEA]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 7 days.