Added note to indicate how to enable spring-boot-docker-compose module in @SpringBootTest tests

Comment From: pivotal-cla

@OnSuorce Please sign the Contributor License Agreement!

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Comment From: pivotal-cla

@OnSuorce Thank you for signing the Contributor License Agreement!

Comment From: OnSuorce

Hi, Did i write the pull request message wrongly? It seems to me that the issue #35661 was not recognized.

Comment From: wilkinsona

No, everything's fine. I don't think GitHub lets you reference an issue from the title of an issue or PR, that's all. Thanks for the PR.

Comment From: OnSuorce

No, everything's fine. I don't think GitHub lets you reference an issue from the title of an issue or PR, that's all. Thanks for the PR.

Ok, next time i'll reference it from the description

Comment From: wilkinsona

@OnSuorce thank you very much for making your first contribution to Spring Boot.

Comment From: OnSuorce

@wilkinsona Thank you for your help. Looking forward to contributing again