Reword misleading help text for kubectl patch

pkg/kubectl/cmd/patch.go

@@ -57,7 +57,7 @@ func NewCmdPatch(f *cmdutil.Factory, out io.Writer) *cobra.Command {
 
 	cmd := &cobra.Command{
 		Use:     "patch (-f FILENAME | TYPE NAME) -p PATCH",
-		Short:   "Update field(s) of a resource by stdin.",
+		Short:   "Update field(s) of a resource using strategic merge patch.",
 		Long:    patch_long,
 		Example: patch_example,
 		Run: func(cmd *cobra.Command, args []string) {