Docs: Add Spring Boot 3 management-port + actuator exposure example for /v3/api-docs and Swagger UI

[RituMalav]

Summary

Request to add a short docs section showing how to expose /v3/api-docs and Swagger UI when Spring Boot 3 uses a separate management port.

Problem

Many apps run actuator on a different management port. New users are unsure which properties are required so that /v3/api-docs and Swagger UI are available on the management port, and what URLs to hit.

Proposal

Add a docs snippet with:

• application.yml showing management.server.port, management.endpoints.web.exposure.include, and springdoc properties.
• Expected URLs for /actuator, /v3/api-docs, and /swagger-ui/index.html when management port is enabled.
• One-line curl example to verify.

Plan

I will open a PR adding a small “Management port + Actuator” example to the README (or the appropriate docs page) with a minimal configuration and verification steps.

[RituMalav]

Opened PR #3148 to add the docs section. Happy to adjust wording/placement.