repository-resources.adoc HATEOAS broken link. [DATAREST-1392]

[spring-projects-issues]

davidlj95 opened DATAREST-1392 and commented

As the "understanding" section is not published any more, move link to Markdown file in the GitHub repository

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Reference URL: https://github.com/spring-projects/spring-data-rest/blob/master/src/main/asciidoc/repository-resources.adoc

Referenced from: pull request #356