Fix PDF document grouping logic to ensure correct page distribution according to pagesPerDocument

Signed-off-by: stroller <[email protected]>

Author: jiafu1115

document-readers/pdf-reader/src/main/java/org/springframework/ai/reader/pdf/PagePdfDocumentReader.java

@@ -44,6 +44,7 @@
  * pageBottomMargin = 0
  *
  * @author Christian Tzolov
+ * @author Fu Jian
  */
 public class PagePdfDocumentReader implements DocumentReader {
 
@@ -119,7 +120,7 @@ public List<Document> get() {
 				pagesPerDocument++;
 
 				if (this.config.pagesPerDocument != PdfDocumentReaderConfig.ALL_PAGES
-						&& pagesPerDocument >= this.config.pagesPerDocument) {
+						&& pagesPerDocument > this.config.pagesPerDocument) {
 					pagesPerDocument = 0;
 
 					var aggregatedPageTextGroup = pageTextGroupList.stream().collect(Collectors.joining());