Remove references to removed fixture [skip ci]

Author: adamtheturtle

src/mock_vws/_validators.py

@@ -688,8 +688,6 @@ def validate_image_size(
         The result of calling the endpoint.
         An `UNPROCESSABLE_ENTITY` response if the image is given and is not
         under a certain file size threshold.
-        This threshold is documented as being 2 MB but it is actually
-        slightly larger. See the `png_large` fixture for more details.
     """
     request, context = args
 

tests/mock_vws/test_add_target.py

@@ -389,10 +389,7 @@ def test_image_valid(
     ) -> None:
         """
         JPEG and PNG files in the RGB and greyscale color spaces are
-        allowed. The image must be under a threshold.
-
-        This threshold is documented as being 2 MB but it is actually
-        slightly larger. See the `png_large` fixture for more details.
+        allowed.
         """
         image_data = image_file.read()
         image_data_encoded = base64.b64encode(image_data).decode('ascii')

tests/mock_vws/test_update_target.py

@@ -711,9 +711,6 @@ def test_image_valid(
         """
         JPEG and PNG files in the RGB and greyscale color spaces are
         allowed. The image must be under a threshold.
-
-        This threshold is documented as being 2 MB but it is actually
-        slightly larger. See the `png_large` fixture for more details.
         """
         image_data = image_file.read()
         image_data_encoded = base64.b64encode(image_data).decode('ascii')