[Docs] Relationships: Mismatach between docs and application

### Current State
In [Relationships docs page](https://docs.layer5.io/kanvas/concepts/relationships/#2-hierarchical-relationships), there are two hierarchical relationships listed - Hierarchical-Inventory and Hierarchical-Parent. However, there are four hierarchical relationships listed in the Layers Sidebar in Kanvas: Hierarchical Inventory, Hierarchical Wallet, Hierarchical Alias and Hierarchical TagSets.

An entry for Edge Annotation is missing as well in the docs.

Screenshot of Kanvas for reference:

### Desired State
The documentation must be updated to match the application.

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#### Contributor Guide and Resources
- 📚 [Instructions for contributing to documentation](https://github.com/layer5io/docs/blob/master/CONTRIBUTING.md)
- Layer5 documentation [site](https://docs.layer5.io) and [source](https://github.com/layer5io/docs/)
- 🎨 Wireframes and [designs for Layer5 site](https://www.figma.com/file/5ZwEkSJwUPitURD59YHMEN/Layer5-Designs) in Figma [(open invite)](https://www.figma.com/team_invite/redeem/GvB8SudhEOoq3JOvoLaoMs)
- 🙋🏾🙋🏼 Questions: [Layer5 Discussion Forum](https://discuss.layer5.io) and [Layer5 Community Slack](http://slack.layer5.io)