Redundant symbol in User Guide

[phaebaez]

Warning is never used anywhere else except here in the document.

[nus-pe-bot]

Team's Response

It is used in one of our feature descriptions below.

Items for the Tester to Verify

:question: Issue response

Team chose [response.Rejected]

• [ ] I disagree

Reason for disagreement: [replace this with your reason]

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