updated doxygen usage and examples for ecmd namespace
updated doxygen usage and examples for ecmd namespace

open-power/eCMD,open-power/eCMD,open-power/eCMD,mklight/eCMD,mklight/eCMD,mklight/eCMD,open-power/eCMD,open-power/eCMD,mklight/eCMD,mklight/eCMD