Lack of `edit` feature in User Guide

[nus-se-bot]

Expected: Since edit is given as possible feature, it should be documented on how to use it.

Actual: There is no section on edit in the User Guide.

Rationale: In most applications, CRUD functionality forms the core of the app. Excluding edit from the UG might confuse readers who would think that there is no edit/update (U) feature. In addition, edit is only applicable for personal tasks, this should be made clear in a section of its own, since it personal tasks are only a small portion of your timetabling app.

User Guide's table of contents:

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_{[original: nus-cs2113-AY2122S1/pe-interim#1096] [original labels: severity.High type.DocumentationBug]}

[adricpjw]

Team's Response

Downgrade of severity:
The edit feature is available in the command summary and when using help in the app.

Duplicate status (if any):

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