doc: replace with valid png images

PR #18789 missed one png that pngcheck was unhappy with

Signed-off-by: David B. Kinder <david.b.kinder@intel.com>
This commit is contained in:
David B. Kinder 2019-08-29 17:36:15 -07:00 committed by Ioannis Glaropoulos
commit 551251ace9

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