Fix xml doc comment for SimpleConsoleFormatterOptions.SingleLine (#42896

)

Setting it to `true` forces the single line, not `false` :)

src/libraries/Microsoft.Extensions.Logging.Console/src/SimpleConsoleFormatterOptions.cs

@@ -16,7 +16,7 @@ public SimpleConsoleFormatterOptions() { }
  public LoggerColorBehavior ColorBehavior { get; set; }
 
  /// <summary>
- /// When <see langword="false" />, the entire message gets logged in a single line.
+ /// When <see langword="true" />, the entire message gets logged in a single line.
  /// </summary>
  public bool SingleLine { get; set; }
  }