update comments

Author: 3ace

ocr/hocr_sample.go

@@ -4,6 +4,10 @@
  * output. The program parses the HOCR response and extracts word-level information
  * including bounding boxes and confidence scores.
  *
+ * This example uses https://github.com/unidoc/ocrserver as the OCR service.
+ * However, UniPDF's OCR API is designed to support other OCR services that accept
+ * image uploads via HTTP and return text or HOCR formatted results.
+ *
  * Run as: go run hocr_sample.go input.jpg
  */
 package main

ocr/ocr_batch.go

@@ -4,6 +4,10 @@
  * The program processes multiple image files concurrently and displays the extracted
  * text results along with a summary of successful and failed operations.
  *
+ * This example uses https://github.com/unidoc/ocrserver as the OCR service.
+ * However, UniPDF's OCR API is designed to support other OCR services that accept
+ * image uploads via HTTP and return text or HOCR formatted results.
+ *
  * Run as: go run ocr_batch.go image1.jpg image2.png [image3.jpg ...]
  */
 package main

ocr/ocr_sample.go

@@ -3,6 +3,10 @@
  * to perform OCR on an image using an HTTP OCR service. The program sends an image
  * to the configured OCR endpoint and displays the extracted text.
  *
+ * This example uses https://github.com/unidoc/ocrserver as the OCR service.
+ * However, UniPDF's OCR API is designed to support other OCR services that accept
+ * image uploads via HTTP and return text or HOCR formatted results.
+ *
  * Run as: go run ocr_sample.go input.jpg
  */
 package main

ocr/reconstruct_pdf_from_hocr.go

@@ -3,6 +3,10 @@
  * to extract text from within images in a PDF using an OCR service that returns
  * HOCR formatted output then writes the reconstructed text to a new PDF.
  *
+ * This example uses https://github.com/unidoc/ocrserver as the OCR service.
+ * However, UniPDF's OCR API is designed to support other OCR services that accept
+ * image uploads via HTTP and return text or HOCR formatted results.
+ *
  * Run as: go run reconstruct_pdf_from_hocr.go input.pdf
  */
 package main