Adding a tag does not allow white spaces

[Rikko1204]

Problem: It was not mentioned in the UG that tag cannot allow white spaces

[soc-pe-bot]

Team's Response

We did mentioned that Tags should be alphanumeric, but we could've done better in being more specific.

Items for the Tester to Verify

:question: Issue response

Team chose [response.Rejected]

• [ ] I disagree

Reason for disagreement: [replace this with your explanation]

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## :question: Issue type Team chose [`type.FeatureFlaw`] Originally [`type.FunctionalityBug`] - [ ] I disagree **Reason for disagreement:** [replace this with your explanation]

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## :question: Issue severity Team chose [`severity.VeryLow`] Originally [`severity.Medium`] - [x] I disagree **Reason for disagreement:** It is a potentially big problem that can affect a lot of users as clarity can be hindered without whitespaces. Think `potentialTAforCS2103T` vs `potential TA for CS2103T`

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