Add details about how the Toggle-Based Rejection Reason Display works.

[shrikruti-hc]

The documentation currently doesn't explain how the toggle for showing rejection reasons works in the Rejection Reasons section of the Fulfillment App.

https://github.com/shrikruti-hc/oms-documentation/blob/641122b1e1aee1c64b8bfbc57afdc6a81ed3d35d/documents/store-operations/fulfillment/rejection.md

Please add simple, clear details about how the toggle works, including what happens when it's turned on and off. Provide examples to help users understand how to use the enable/disable option of the toggle.