Correct FullStory dynamic_settings example
Correct FullStory dynamic_settings example

refs UX-31
flag=enable_fullstory

test plan: n/a

Change-Id: If15c13d1df9ff79a37bcb237877b0b860a013d22
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/231472
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>
Reviewed-by: James Williams <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>
QA-Review: James Williams <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>
Product-Review: James Williams <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>

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