docs: fix typo

[Radovenchyk]

most of the links were unclickable

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Change Summary

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PR-Codex overview

This PR updates the documentation in docs/docs.md, primarily focusing on correcting section titles and restructuring the numbering of the sections related to contracts and registries.

Detailed summary

• Updated section title from Id Manager to Id Gateway.
• Updated section title from Key Manager to Key Gateway.
• Renumbered sections for Key Registry, Key Gateway, Validators, Bundler, and Recovery Proxy accordingly.

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