fix docs for "Show provisional grade status"
fix docs for "Show provisional grade status"

test plan:
 - render docs
 - the endpoint should be documented
 - the example_request URL should be correct

fixes CNVS-25121

Change-Id: Ia1bfd85da0a02aee095f28c36f2faddc3f19c7e5
Reviewed-on: https://gerrit.instructure.com/67399
Tested-by: Jenkins
Reviewed-by: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>
QA-Review: Clare Strong <40d6bb3ed7fef516c73274131d5a837c16de74fd@instructure.com>
Product-Review: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>

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