Updated links in documentation. (#328)

Updated to reflect new GitHub organization.
Fixed broken links to GitHub pages.

Signed-off-by: David Galiffi <David.Galiffi@amd.com>

cmake/omniperf.lua.in

@@ -12,7 +12,7 @@ whatis("Name: omniperf")
 whatis("Version: @OMNIPERF_FULL_VERSION@")
 whatis("Keywords: Profiling, Performance, GPU")
 whatis("Description: tool for GPU performance profiling")
-whatis("URL: https://github.com/AMDResearch/omniperf")
+whatis("URL: https://github.com/ROCm/omniperf")
 
 -- Export environmental variables
 local topDir="@CMAKE_INSTALL_PREFIX@"