Issue 2260, document Clean() pattern for intermediate directories
Issue 2260, document Clean() pattern for intermediate directories

git-svn-id: 7892167f69f80ee5d3024affce49f20c74bcb41d@4049 fdb21ef1-2011-0410-befe-b5e4ea1792b1

azverkan/scons,azverkan/scons,azverkan/scons,azverkan/scons,azverkan/scons