Remove mentions of extending RepositoryRestMvcConfiguration in favor of RepositoryRestConfigurer [DATAREST-1004]

[spring-projects-issues]

Oliver Drotbohm opened DATAREST-1004 and commented

RRMC is still mentioned in http://docs.spring.io/spring-data/rest/docs/current/reference/html/#validation

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Affects: 2.6 GA (Ingalls), 2.5.7 (Hopper SR7)