Revamp OAuth 2.0 Login/Client reactive documentation

The OAuth 2.0 Login and OAuth 2.0 Client reference documentation for Reactive Applications is completely out-of-date compared to the Servlet Applications. This needs to be updated so both are in sync.

Related #8173

### Servlet Applications

[OAuth 2.0 Login](https://docs.spring.io/spring-security/servlet/oauth2/login/index.html)
[OAuth 2.0 Client](https://docs.spring.io/spring-security/servlet/oauth2/client/index.html)

### Reactive Applications

[OAuth 2.0 Login](https://docs.spring.io/spring-security/reactive/oauth2/login.html)
[OAuth 2.0 Client](https://docs.spring.io/spring-security/reactive/oauth2/client/index.html)


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Revamp OAuth 2.0 Login/Client reactive documentation #8174

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Revamp OAuth 2.0 Login/Client reactive documentation #8174

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Servlet Applications

Reactive Applications

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

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