fix markdown images
docs/guide/cni.md: fix markdown images
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Welcome @huapox! It looks like this is your first PR to kubeedge/edgemesh 🎉
/assign @Poorunga
@huapox DCO fialed, Please add --signoff on your commits.
@huapox DCO fialed, Please add
--signoffon your commits.
@Poorunga resolved
@ZBoIsHere @Poorunga review please