update stream item api doc for conversations
update stream item api doc for conversations

Change-Id: Ic568c00ba956a2f166cbc02d0137ccab2579a59d
Reviewed-on: https://gerrit.instructure.com/5667
Reviewed-by: Zach Pendleton <514dbb4d54d4f29e454990df7d075678f43f92aa@instructure.com>
Reviewed-by: Jacob Fugal <f862f167b85d41b225785c70d70808bc7337c1fe@instructure.com>
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>

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