Replace /content with / in GSG links

[Delivers #54822628]

README.md

 Set up the project
 ------------------
 
-First you set up a basic build script. You can use any build system you like when building apps with Spring, but the code you need to work with [Maven](https://maven.apache.org) and [Gradle](http://gradle.org) is included here. If you're not familiar with either, refer to [Building Java Projects with Maven](/guides/gs/maven/content) or [Building Java Projects with Gradle](/guides/gs/gradle/content).
+First you set up a basic build script. You can use any build system you like when building apps with Spring, but the code you need to work with [Maven](https://maven.apache.org) and [Gradle](http://gradle.org) is included here. If you're not familiar with either, refer to [Building Java Projects with Maven](/guides/gs/maven/) or [Building Java Projects with Gradle](/guides/gs/gradle/).
 
 ### Create the directory structure
 
 </project>
 ```
 
-This guide is using [Spring Boot's starter POMs](/guides/gs/spring-boot/content).
+This guide is using [Spring Boot's starter POMs](/guides/gs/spring-boot/).
 
 Note to experienced Maven users who are unaccustomed to using an external parent project: you can take it out later, it's just there to reduce the amount of code you have to write to get started.
 
 
 [spring-boot-maven-plugin]: https://github.com/SpringSource/spring-boot/tree/master/spring-boot-maven-plugin
 
-> **Note:** The procedure above will create a runnable JAR. You can also opt to [build a classic WAR file](/guides/gs/convert-jar-to-war/content) instead.
+> **Note:** The procedure above will create a runnable JAR. You can also opt to [build a classic WAR file](/guides/gs/convert-jar-to-war/) instead.
 
 Run the service
 -------------------