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; }
     }