docs: throughly document DataTypes (v6)

[fzn0x]

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Improve the example datatypes TEXT, makes the documentation beginner-friendly as much as possible.

Follow-Up Tasks

• Added more helpful content for datatypes that only show description in Sequelize API reference (v6).

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[WikiRik]

Let's refer to https://github.com/sequelize/website/blob/main/docs/other-topics/other-data-types.mdx in v7 For v6 I think we could do the same, but we should update that page first (see https://github.com/sequelize/website/pull/11 for that)

[fzn0x]

Let's refer to https://github.com/sequelize/website/blob/main/docs/other-topics/other-data-types.mdx in v7 For v6 I think we could do the same, but we should update that page first (see #11 for that)

Thank you! will start working on this

[fzn0x]

Hi bro @WikiRik I added the requested changes. Need help to review it before merging :)

cc @ephys

[fzn0x]

Added follow up tasks in PR description

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