Fix sample codes (dotnet#4009)

Author: nxtn

xml/System.IO.Log/IRecordSequence.xml

@@ -1212,51 +1212,45 @@ using System;
                           "This is record A",  
                           SequenceNumber.Invalid,  
                           SequenceNumber.Invalid);  
-         Console.WriteLine("Record A has sequence number System.IO.Log", a);  
+         Console.WriteLine($"Record A has sequence number {a}");  
   
          b = AppendRecord(sequence,  
                           "This is record B",  
                           a,  
                           a);  
-         Console.WriteLine("Record B has sequence number System.IO.Log", b);  
+         Console.WriteLine($"Record B has sequence number {b}");  
   
          c = AppendRecord(sequence,  
                           "This is record C",  
                           a,  
                           a);  
-         Console.WriteLine("Record C has sequence number System.IO.Log", c);  
+         Console.WriteLine($"Record C has sequence number {c}");  
   
          d = AppendRecord(sequence,  
                           "This is record D",  
                           b,  
                           c);  
-         Console.WriteLine("Record D has sequence number System.IO.Log", d);  
+         Console.WriteLine($"Record D has sequence number {d}");  
   
          foreach(LogRecord record in  
                  sequence.ReadLogRecords(a, ReadDirection.Forward))  
          {  
              BinaryReader reader = new BinaryReader(record.Data);  
-             Console.WriteLine("System.IO.Log: T:System.IO.Log.IRecordSequence",  
-                               record.SequenceNumber,  
-                               reader.ReadString());  
+             Console.WriteLine($"{record.SequenceNumber}: {reader.ReadString()}");  
          }  
   
          foreach(LogRecord record in  
                  sequence.ReadLogRecords(d, ReadDirection.User))  
          {  
              BinaryReader reader = new BinaryReader(record.Data);  
-             Console.WriteLine("System.IO.Log: T:System.IO.Log.IRecordSequence",  
-                               record.SequenceNumber,  
-                               reader.ReadString());  
+             Console.WriteLine($"{record.SequenceNumber}: {reader.ReadString()}");  
          }  
   
          foreach(LogRecord record in  
                  sequence.ReadLogRecords(d, ReadDirection.Previous))  
          {  
              BinaryReader reader = new BinaryReader(record.Data);  
-             Console.WriteLine("System.IO.Log: T:System.IO.Log.IRecordSequence",  
-                               record.SequenceNumber,  
-                               reader.ReadString());  
+             Console.WriteLine($"{record.SequenceNumber}: {reader.ReadString()}");  
          }  
      }  
        }