things-manager: Updated doxygen comments for ThingsManager.h
things-manager: Updated doxygen comments for ThingsManager.h

Updated and fixed some issues w.r.t doxygen comments in ThingsManager.h file

Change-Id: Icafdaa0bd00b275b1e7423ea25d22601bcab9323
Signed-off-by: Ravi Nanjundappa <2b6ed790834a9696042087f8677f81934b9f07fd@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/2276
Tested-by: jenkins-iotivity <09cb29e8a2b473a2c978382eec13ee06fa017bda@opendaylight.org>
Reviewed-by: Jon A. Cruz <d4ae605477945a543a3ecda8955c93978db16a84@osg.samsung.com>

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