Update comment message on DynamicSample example
Update comment message on DynamicSample example

Signed-off-by: Narumol Prangnawarat <69edcbdcd87555e3afc9489509030a49766559ed@arm.com>
Change-Id: I7e67400d7cd2b83aa55320c0739c531625ed32be

ARM-software/armnn,ARM-software/armnn,ARM-software/armnn