Docs: update custom pre-processing class to import from correct origin (#2731)

Docs: update custom pre-processing class to import from origin correctly
Currently the docs import `get_exportable_transform` by means of
`from anomalib.utils.transform import get_exportable_transform`
which no longer exists as of `v2.0.0`. This file is now at
`anomalib.pre_processing.utils.transform` as per 084331d.

Signed-off-by: Lucian Chauvin <lucianchauvin@gmail.com>

Author: lucianchauvin

CHANGELOG.md

@@ -16,6 +16,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Changed
 
+- Update import location for `get_exportable_transform` from `anomalib.utils.transform` to `anomalib.pre_processing.utils.transform`. This update aligns with the reorganization of the `anomalib` project in `v2.0.0`, and the previous path no longer exists.
+
 ### Deprecated
 
 ### Fixed

docs/source/markdown/guides/how_to/models/pre_processor.md

@@ -215,7 +215,7 @@ Advanced users may want to define their own pre-processing pipeline. This can be
 
 ```python
 from anomalib.pre_processing import PreProcessor
-from anomalib.utils.transform import get_exportable_transform
+from anomalib.pre_processing.utils.transform import get_exportable_transform
 from torchvision.transforms.v2 import Transform