fix: Resolve various javadoc and checkstyle issues

Author: tzolov

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

@@ -22,6 +22,7 @@
 import org.springframework.aot.hint.RuntimeHints;
 import org.springframework.aot.hint.RuntimeHintsRegistrar;
 import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
+import org.springframework.lang.NonNull;
 
 /**
  * The PdfReaderRuntimeHints class is responsible for registering runtime hints for PDFBox
@@ -34,7 +35,7 @@
 public class PdfReaderRuntimeHints implements RuntimeHintsRegistrar {
 
 	@Override
-	public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
+	public void registerHints(@NonNull RuntimeHints hints, ClassLoader classLoader) {
 		try {
 
 			var resolver = new PathMatchingResourcePatternResolver();

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

@@ -184,6 +184,7 @@ else if (paragraph.level() == level) {
 	 * @param level The TOC deepness level for this paragraph. The root is at level 0.
 	 * @param startPageNumber The page number in the PDF where this paragraph begins.
 	 * @param endPageNumber The page number in the PDF where this paragraph ends.
+	 * @param position The vertical position of the paragraph on the page.
 	 * @param children Sub-paragraphs for this paragraph.
 	 */
 	public record Paragraph(Paragraph parent, String title, int level, int startPageNumber, int endPageNumber,

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

@@ -100,7 +100,6 @@ private void writeToOutputStream(final List<TextLine> textLineList) throws IOExc
 	 * In order to get rid of the warning: TextPositionComparator class should implement
 	 * Comparator<TextPosition> instead of Comparator
 	 */
-	@SuppressWarnings("unchecked")
 	private void sortTextPositionList(final List<TextPosition> textList) {
 		TextPositionComparator comparator = new TextPositionComparator();
 		Collections.sort(textList, comparator);