combining 3 ingest docs (#10177)

* combining 3 ingest pipeline docs

Signed-off-by: Anton Rubin <anton.rubin@eliatra.com>

* Apply suggestions from code review

Signed-off-by: Nathan Bower <nbower@amazon.com>

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Signed-off-by: Anton Rubin <anton.rubin@eliatra.com>
Signed-off-by: Nathan Bower <nbower@amazon.com>
Co-authored-by: Nathan Bower <nbower@amazon.com>

Author: AntonEliatra