Merge pull request #489 from AntonyCorbett/perf_linq_02

Small perf improvement in LINQ (2)

Source/QuestPDF/Infrastructure/PageContext.cs

@@ -39,7 +39,7 @@ namespace QuestPDF.Infrastructure
 
         public DocumentLocation? GetLocation(string name)
         {
-            return Locations.FirstOrDefault(x => x.Name == name);
+            return Locations.Find(x => x.Name == name);
         }
     }
 }