SpringBoot Remove "earlier in this chapter" from places where content is now elsewhere in the documentation

Remove all occurrences of , earlier in this chapter, as this is no longer true.

Comment From: pivotal-cla

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Comment From: pivotal-cla

@anthonyvdotbe Thank you for signing the Contributor License Agreement!

Comment From: snicoll

@anthonyvdotbe thank you for making your first contribution to Spring Boot.