Added the column name note

pkg/caret/inst/NEWS.Rd

@@ -28,6 +28,7 @@
 		\item Several PLS models were using the classical orthogonal scores algorithm when discriminant analysis was conducted (despite using \code{simpls}, \code{widekernelpls}, or \code{kernelpls}). Now, the PLSDA model estimation method is consistent with the method requested (\issue{610}). 
 		\item Added Multi-Step Adaptive MCP-Net (\code{method = "msaenet"}) for \issue{561}. 
 		\item The variable importance score for linear regression was modified so that missing values in the coefficients are converted to zero.
+		\item In \code{train}, \code{x} is now required to have column names. 
 
 	}
 }