Fix broken links in the documentation

spring-boot-docs/src/main/asciidoc/documentation-overview.adoc

@@ -38,7 +38,7 @@ Having trouble with Spring Boot, We'd like to help!
 * Report bugs with Spring Boot at https://github.com/spring-projects/spring-boot/issues.
 
 NOTE: All of Spring Boot is open source, including the documentation! If you find problems
-with the docs; or if you just want to improve them, please <<github-code, get involved>>.
+with the docs; or if you just want to improve them, please {github-code}[get involved].
 
 [[boot-documentation-first-steps]]
 == First steps

spring-boot-docs/src/main/asciidoc/getting-started.adoc

@@ -157,8 +157,9 @@ installed you can follow the instructions at http://www.gradle.org/.
 Spring Boot dependencies can be declared using the `org.springframework.boot` `group`.
 Typically your project will declare dependencies to one or more
 <<using-spring-boot.adoc#using-boot-starter-poms, ``Starter POMs''>>. Spring Boot
-provides a useful <<build-tool-plugins.adoc#build-tool-plugins-gradle, Gradle plugin>>
-that can be used to simplify dependency declarations and to create executable jars.
+provides a useful <<build-tool-plugins.adoc#build-tool-plugins-gradle-plugin, Gradle
+plugin>> that can be used to simplify dependency declarations and to create executable
+jars.
 
 .Gradle Wrapper
 ****
@@ -721,8 +722,8 @@ Hopefully this section has provided you with some of the Spring Boot basics, and
 on your way to writing your own applications. If you're a task-oriented type of
 developer you might want to jump over to http://spring.io and check out some of the
 http://spring.io/guides/[getting started] guides that solve specific
-'``How do I do that with Spring''' problems; we also have a Spring Boot specific
-'<<howto.adoc#how-to, How-to>>' reference documentation.
+'``How do I do that with Spring''' problems; we also have Spring Boot-specific
+'<<howto.adoc#howto, How-to>>' reference documentation.
 
 Otherwise, the next logical step is to read '<<using-spring-boot.adoc#using-boot>>'. If
 you're really impatient, you could also jump ahead and read about