CASMTRIAGE-7286 Add CSM DIAGS product to Update customizations.yaml l…

…ist (#5407)

* Add CSM DIAGS product to Update customizations.yaml list

* Apply suggestions from code review

Signed-off-by: Nathan Rockershousen <nathan.rockershousen@hpe.com>

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Signed-off-by: Nathan Rockershousen <nathan.rockershousen@hpe.com>
Co-authored-by: Nathan Rockershousen <nathan.rockershousen@hpe.com>

operations/iuf/workflows/product_delivery.md

@@ -43,8 +43,8 @@ Once this step has completed:
 
 **`NOTE`** This subsection is optional and can be skipped if upgrading only CSM through IUF.
 
-Some products require modifications to the `customizations.yaml` file before executing the `deliver-product` stage. Currently, this is limited to the Slurm and PBS Workload Manager (WLM) products and the UAN product. Refer to the
-"Install and Upgrade Framework" section of the Slurm, PBS, and UAN product documents to determine the actions that need to be performed to update `customizations.yaml`.
+Some products require modifications to the `customizations.yaml` file before executing the `deliver-product` stage. Currently, this is limited to the Slurm and PBS Workload Manager (WLM) products, CSM Diags, and the UAN product. Refer to the
+"Install and Upgrade Framework" section of the Slurm, PBS, CSM Diags, and UAN product documents to determine the actions that need to be performed to update `customizations.yaml`.
 
 Once this step has completed: