Rename CustomPDDocumentFactory to CustomPDFDocumentFactory across multiple controllers (#3163)

# Description of Changes

Please provide a summary of the changes, including:

- What was changed
- Why the change was made
- Any challenges encountered

Closes #(issue_number)

---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

---------

Co-authored-by: Anthony Stirling <77850077+Frooodle@users.noreply.github.com>

src/main/java/stirling/software/SPDF/controller/api/PdfOverlayController.java

@@ -26,7 +26,7 @@ import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;
 
 import stirling.software.SPDF.model.api.general.OverlayPdfsRequest;
-import stirling.software.SPDF.service.CustomPDDocumentFactory;
+import stirling.software.SPDF.service.CustomPDFDocumentFactory;
 import stirling.software.SPDF.utils.GeneralUtils;
 import stirling.software.SPDF.utils.WebResponseUtils;
 
@@ -35,10 +35,10 @@ import stirling.software.SPDF.utils.WebResponseUtils;
 @Tag(name = "General", description = "General APIs")
 public class PdfOverlayController {
 
-    private final CustomPDDocumentFactory pdfDocumentFactory;
+    private final CustomPDFDocumentFactory pdfDocumentFactory;
 
     @Autowired
-    public PdfOverlayController(CustomPDDocumentFactory pdfDocumentFactory) {
+    public PdfOverlayController(CustomPDFDocumentFactory pdfDocumentFactory) {
         this.pdfDocumentFactory = pdfDocumentFactory;
     }
 
@@ -46,7 +46,8 @@ public class PdfOverlayController {
     @Operation(
             summary = "Overlay PDF files in various modes",
             description =
-                    "Overlay PDF files onto a base PDF with different modes: Sequential, Interleaved, or Fixed Repeat. Input:PDF Output:PDF Type:MIMO")
+                    "Overlay PDF files onto a base PDF with different modes: Sequential,"
+                            + " Interleaved, or Fixed Repeat. Input:PDF Output:PDF Type:MIMO")
     public ResponseEntity<byte[]> overlayPdfs(@ModelAttribute OverlayPdfsRequest request)
             throws IOException {
         MultipartFile baseFile = request.getFileInput();