Update and rename RasterizedPdf.java to RasterizedPDF.java

Fix file name and class to match conventions

Java/Endpoint Examples/Multipart Payload/RasterizedPdf.java → Java/Endpoint Examples/Multipart Payload/RasterizedPDF.java

@@ -5,7 +5,7 @@
 import okhttp3.*;
 import org.json.JSONObject;
 
-public class RasterizedPdf {
+public class RasterizedPDF {
 
   // Specify the path to your file here, or as the first argument when running the program.
   private static final String DEFAULT_FILE_PATH = "/path/to/file.pdf";