clarify tflm api intro
clarify tflm api intro

Change-Id: Ice3be4c401b1075ba83003416b5218669cc06e2b
GitOrigin-RevId: fbb58f844ad588a960e363274982a70164c9bf10

google-coral/coralmicro,google-coral/coralmicro,google-coral/coralmicro,google-coral/coralmicro,google-coral/coralmicro