updated note and added bugfix note

Author: andy-bridger

docs/source/release/v6.13.0/Diffraction/Engineering/Bugfixes/38863.rst

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+- When Calibrating/Focusing, either within the interface or in a script, the calibration information is now updately more reliably. Previously, when swapping custom roi or spectra lists after a calibration/focusing had already been run, the new roi wasn't being properly updated when recalibrated/refocused.

docs/source/release/v6.13.0/Diffraction/Engineering/New_features/38863.rst

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 - Renamed `Crop Calibration` within the `Engineering Diffraction` calibration interface to `Set Calibration Region of Interest` to more accurately reflect its functionality.
-- Renamed `Custom CalFile` to `Custom Grouping File` and allowed the provided file to be `.xml` as well as `.cal`. This brings it inline with the current detector grouping IO algorithms, :ref:`SaveDetectorsGrouping <algm-SaveDetectorsGrouping-v1>` and :ref:`LoadDetectorsGroupingFile <algm-LoadDetectorsGroupingFile-v1>`.
+- Renamed `Custom CalFile` to `Custom Grouping File` and allowed the provided file to be `.xml` as well as `.cal`. This brings it inline with the current detector grouping IO algorithms, :ref:`algm-SaveDetectorsGrouping-v1` and :ref:`algm-LoadDetectorsGroupingFile-v1`.
 - Changed the naming suffix for custom file example_group.xml from _Custom to _Custom_example_group so they don't get overwritten when custom grouping is changed (also more clear to the user what grouping is being used).
-- Changed it so the vanadium normalisation is always rerun for GROUP.CUSTOM and GROUP.CROPPED
+- Changed the naming suffix for cropped spectrum list: example_list from _Cropped to _Cropped_example_list so they don't get overwritten when custom grouping is changed (also more clear to the user what grouping is being used).
+- Added a warning to Focusing for when the vanadium normalisation has been loaded from the ADS