Update validation text comment to clarify 50 Carroll location

pdf_comparator 2.py

@@ -367,7 +367,7 @@ def _is_in_excluded_bottom_area(box: Box, image_height: int, excluded_height_mm:
     return box.y1 >= excluded_top
 
 def _contains_validation_text(text: str) -> bool:
-    """Check if text contains the validation text '50 Carroll'"""
+    """Check if text contains the validation text '50 Carroll' (only exists in lower 115mm)"""
     return "50 Carroll" in text
 
 def load_pdf_pages(path: str, dpi: int = 600, max_pages: int = 15) -> List[Image.Image]: