resolving minor comments

Author: artidoro

src/Microsoft.ML.Data/DataLoadSave/Text/TextLoader.cs

@@ -396,7 +396,7 @@ internal bool TryUnparse(StringBuilder sb)
         }
 
         /// <summary>
-        /// The settings for <see cref="TextLoader"/>
+        /// The options for <see cref="TextLoader"/>
         /// </summary>
         public class Options
         {
@@ -433,7 +433,7 @@ public class Options
             internal string Separator = Defaults.Separator.ToString();
 
             /// <summary>
-            /// The characters that should be used as separators column separator.
+            /// The characters used as separators between data points in a row. By default the tab character is used as separator.
             /// </summary>
             [Argument(ArgumentType.AtMostOnce, Name = nameof(Separator), Visibility = ArgumentAttribute.VisibilityType.EntryPointsOnly, HelpText = "Source column separator.", ShortName = "sep")]
             public char[] Separators = new[] { Defaults.Separator };