Fix Vision Product Search sample comment typo (#1897)

Author: alixhami

vision/cloud-client/product_search/product_management.py

@@ -55,7 +55,7 @@ def create_product(
     location_path = client.location_path(project=project_id, location=location)
 
     # Create a product with the product specification in the region.
-    # Set product name and product display name.
+    # Set product display name and product category.
     product = vision.types.Product(
         display_name=product_display_name,
         product_category=product_category)