docs: Fix incorrect highlight in an example snippet

[MAPGarrett]

Description of Change

At the moment, the "Communicating between processes" main.js snippet highlights the line containing }) when the relevant line for this part of the tutorial is ipcMain.handle('ping', () => 'pong'), this change just updates the highlighted line.

Checklist

• PR description included and stakeholders cc'd
• relevant documentation, tutorials, templates and examples are changed or added

Release Notes

Notes: none

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[release-clerk]

No Release Notes

[trop]

I have automatically backported this PR to "23-x-y", please check out #36713