Provide additional documentation (details) on security implications when actuator endpoints are enabled

[olegz]

Review and provide additional details on security implications of exposed actuator endpoint that gives access to Environment variables

[omernaci]

Hi @olegz, I would happy to contribute to the updating of the document.

I have prepared the following paragraph for the relevant part. if it is convenient, I can create a PR.

NOTE: While enabling the POST method for /actuator/env endpoint can provide flexibility and convenience in managing your application environment variables, it's critical to ensure that the endpoint is secured and monitored to prevent potential security risks. Add a spring-boot-starter-security dependency to configure access control for the actuator’s endpoint.

[ryanjbaxter]

A PR would be great!