added documentation

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1057 fdac6126-5c0c-442c-9429-916003d36597
Fixed copy paste typos in the vertex face and face face range code

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1058 fdac6126-5c0c-442c-9429-916003d36597
Typo fixed from last commit

git-svn-id: http://openmesh.org/svnrepo/OpenMesh@1059 fdac6126-5c0c-442c-9429-916003d36597