docs: style corrections for references and concepts

[Apgomeznext]

Description

docs: This PR modifies some elements of the references and concepts documents for the events repository, such as the titles' RST codes and minor grammar corrections:

• docs/concepts/event-bus.rst
• docs/concepts/openedx-events.rst
• docs/reference/event-bus-configurations.rst
• docs/reference/events-data.rst
• docs/reference/events-tooling.rst
• docs/reference/events.rst
• docs/reference/in-line-code-annotations-for-an-event.rst
• docs/reference/oeps.rst

Also, with this Pr, I added a slight modification in the general index order of the repository to improve the user experience in the documentation order: docs/index.rst

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