some posenet docs copyedits
some posenet docs copyedits

Change-Id: I0816453a077aae09ff7dd5daa33d03e4cde594dc
GitOrigin-RevId: e704c7d91b061b721e05e1282f3b1fc84c3ddcd9

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