Add helper comment to Utils function handling end call screen

[anjulgarg]

What

Add helper comment to Utils function handling end call screen

Why

How Tested

Process & policy checklist

• [ ] I have updated the project documentation to reflect my changes if necessary.
• [ ] I have read the CONTRIBUTING documentation.

Is this a breaking change?

• [ ] This change causes current functionality to break.

[github-actions[bot]]

Storybook URL https://60c7ae6891f0e90039d7cd54-cfgaiaxpai.chromatic.com/

[github-actions[bot]]

CallWithChat bundle size is not changed.

• Current size: 5452422
• Base size: 5452422
• Diff size: 0

[github-actions[bot]]

Calling bundle size is not changed.

• Current size: 5067302
• Base size: 5067302
• Diff size: 0

[github-actions[bot]]

Chat bundle size is not changed.

• Current size: 5193184
• Base size: 5193184
• Diff size: 0

[github-actions[bot]]

Storybook URL https://60c7ae6891f0e90039d7cd54-rrbhczxlvr.chromatic.com/