Changing error message

Author: rafaelsc

src/Serilog.Sinks.Console/Sinks/SystemConsole/Rendering/ThemedMessageTemplateRenderer.cs

@@ -102,7 +102,7 @@ int RenderPropertyToken(PropertyToken pt, IReadOnlyDictionary<string, LogEventPr
 
         int RenderAlignedPropertyTokenUnbuffered(PropertyToken pt, TextWriter output, LogEventPropertyValue propertyValue)
         {
-            if(pt.Alignment == null) throw new ArgumentException("Invalid PropertyToken State. The PropertyToken should have a Alignment.", nameof(pt));
+            if(pt.Alignment == null) throw new ArgumentException("The PropertyToken should have a non-null Alignment.", nameof(pt));
 
             var valueOutput = new StringWriter();
             RenderValue(NoTheme, _unthemedValueFormatter, propertyValue, valueOutput, pt.Format);