Fix Reference Guide formatting [DATAGEODE-30]

[spring-projects-issues]

John Blum opened DATAGEODE-30 and commented

The Spring Data Geode Reference Guide formatting is all messed up as the Maven Asciidoctor plugin did not and could not render the Asciidoc document(s) correctly.

This also caused an increase in the build time when generating the docs in different formats (e.g. PDF, etc)

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Affects: 2.0 RC2 (Kay)

Reference URL: https://docs.spring.io/spring-data/geode/docs/2.0.0.RC2/reference/html/

Referenced from: commits 61257ce