Update troubleshooting.md to showcase a workaround for issue #4375

[oliver-dvorski]

What does this PR do?

These changes will impact:

• commenters
• moderators
• admins
• developers

What changes to the GraphQL/Database Schema does this PR introduce?

None

Does this PR introduce any new environment variables or feature flags?

No

Where any tests migrated to React Testing Library?

No

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[nick-funk]

Thanks for taking the time to write this up.

As this isn't something we currently yet support, but would like to, we don't want to post a work around that we don't have time to test the full ramifications of how it might be used across our open source and SaaS services deployments.

While this work around is possibly viable for everyone, we don't have the time to vet it properly, and once something is written up and documented, whether it is labelled as a temporary work around or not, some clients or open source users may expect it to be fully supported.

Hopefully, we'll have time at some point to fix this issue so it doesn't require a work-around. We know that The Verge has Coral inside of a position: fixed div comment drawer without needing this work-around, so there may be another solution to this problem that we can include in our documentation.