Fix API documentation comments

Removed blank lines between Parameters/Returns heading and their tables
Changed API documentation header and footer
Added None below Parameters & Returns where applicable
Open-webOS-DCO-1.0-Signed-off-by: Kalindi Pathare <kalindi.pathare@lge.com>

Change-Id: Id1912ae234420eb9986484a4d1272ce8607f059b
Reviewed-on: https://g2g.palm.com/2732
Reviewed-by: Build Verification
Reviewed-by: Suresh Arumugam <suresh.arumugam@lge.com>
Tested-by: Suresh Arumugam <suresh.arumugam@lge.com>