Svg: file extension fix

Source/QuestPDF/Fluent/SvgExtensions.cs

@@ -86,7 +86,7 @@ public static class SvgExtensions
     /// <include file='../Resources/Documentation.xml' path='documentation/doc[@for="svg.descriptor"]/*' />
     public static SvgImageDescriptor Svg(this IContainer container, string svg)
     {
-        var isFile = Path.GetExtension(svg).Equals("svg", StringComparison.OrdinalIgnoreCase);
+        var isFile = Path.GetExtension(svg).Equals(".svg", StringComparison.OrdinalIgnoreCase);
         
         var image = isFile ? SvgImage.FromFile(svg) : SvgImage.FromText(svg);
         return container.Svg(image);