Add coverage of JSON support to reference guide [SPR-6340]

[spring-projects-issues]

Jeremy Grelle opened SPR-6340 and commented

There is currently no coverage of the JSON support in the reference guide.

Some basic details should be provided to cover:

• MappingJacksonJsonView for rendering JSON representation of model
• How to configure the MappingJacksonJsonView with the ContentNegotiatingViewResolver
• MappingJacksonHttpMessageConverter

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Affects: 3.0 RC1

Referenced from: commits e8845c7