Merge branch '2.2.x' into 2.3.x

Closes gh-22622

spring-boot-project/spring-boot-docs/src/docs/asciidoc/index.adoc

@@ -9,7 +9,7 @@ The reference documentation consists of the following sections:
 <<legal.adoc#legal,Legal>> :: Legal information.
 <<documentation-overview.adoc#boot-documentation,Documentation Overview>> :: About the Documentation, Getting Help, First Steps, and more.
 <<getting-started.adoc#getting-started,Getting Started>> :: Introducing Spring Boot, System Requirements, Servlet Containers, Installing Spring Boot, Developing Your First Spring Boot Application
-<<using-spring-boot.adoc#using-boot,Using Spring Boot>> :: Build Systems, Structuring Your Code, Configuration, Spring Beans and Dependency Injection, and more.
+<<using-spring-boot.adoc#using-boot,Using Spring Boot>> :: Build Systems, Structuring Your Code, Configuration, Spring Beans and Dependency Injection, DevTools, and more.
 <<spring-boot-features.adoc#boot-features,Spring Boot Features>> :: Profiles, Logging, Security, Caching, Spring Integration, Testing, and more.
 <<production-ready-features.adoc#production-ready,Spring Boot Actuator>> :: Monitoring, Metrics, Auditing, and more.
 <<deployment.adoc#deployment,Deploying Spring Boot Applications>> :: Deploying to the Cloud, Installing as a Unix application.