Fix documentation and code mismatch in mlang.CONTAINS
Fix documentation and code mismatch in mlang.CONTAINS

TanayParikh/foam2,foam-framework/foam2,TanayParikh/foam2,foam-framework/foam2,TanayParikh/foam2,jacksonic/vjlofvhjfgm,foam-framework/foam2,jacksonic/vjlofvhjfgm,foam-framework/foam2,TanayParikh/foam2,foam-framework/foam2,jacksonic/vjlofvhjfgm