Closes gh-12584

See gh-12584

* pr/12633:
  Fix Kotlin @ConfigurationProperties example

Closes gh-12633

* pr/12556:
  Polish "Add Redis Sentinel database support"
  Add Redis Sentinel database support

Closes gh-12556

See gh-12556

* pr/12591:
  Polish "Avoid string copies in SpringBootBanner"
  Avoid string copies in SpringBootBanner

Closes gh-12591

See gh-12591

Closes gh-12625

Closes gh-12624

Closes gh-12623

Closes gh-12622

Closes gh-12621

Closes gh-12620

Closes gh-12619

Closes gh-12618

Closes gh-12617

Closes gh-12616

Closes gh-12615

Closes gh-12614

Closes gh-12613

Closes gh-12573

* gh-12554:
  Polish "Use this.out in SummaryProgressReporter.finished()"
  Use this.out in SummaryProgressReporter.finished()

See gh-12554

Closes gh-12554

Closes gh-1778

* pr/12555:
  Rename expose to include

Closes gh-12555

* pr/12553:
  Polish

Closes gh-12553

* pr/12491:
  Add OAuth2 server implementation section to docs

As auto-configuration for Spring Security OAuth has been removed
from Spring Boot 2.0 and Spring Security 5 doesn't have OAuth
2.0 Authorization / Resource Server support yet, it has not
been obvious at all how to implement an OAUth 2.0 server with
Spring Boot 2.0.

For that reason, this new section briefly explains the current
temporary situation and points to the spring-security-oauth2-autoconfigure
module that restores the auto-configuration support for OAuth
2.0 Authorization and Resource Servers.

Closes gh-12491

* pr/12528:
  Polish "Iterate map by using lambda function"
  Iterate map by using lambda function

See gh-12528