Add immersive reader to dynamic_settings example
Add immersive reader to dynamic_settings example

flag=none

Test Plan:
the dynamic settings example file contains
sample configuration for immersive reader

Change-Id: I3db66c9a94456e550f7447c0efa3861b4cb9050f
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/257130
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Mysti Lilla <431d062aff1e8f25416b3a7b732fe6effdb03f9a@instructure.com>
QA-Review: Mysti Lilla <431d062aff1e8f25416b3a7b732fe6effdb03f9a@instructure.com>
Product-Review: Mysti Lilla <431d062aff1e8f25416b3a7b732fe6effdb03f9a@instructure.com>

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