Broken and missing documentation links

[breun]

On https://spring.io/projects/spring-cli#learn 0.7.4 links to https://docs.spring.io/spring-cli/reference/index.html, which actually shows the documentation for version 0.9.0.

I would expect to see the following entries, with https://docs.spring.io/spring-cli/reference/${version} as the generic URL pattern:

• 0.7.4: https://docs.spring.io/spring-cli/reference/0.7.4
• 0.8.1: https://docs.spring.io/spring-cli/reference/0.8.1
• 0.9.0: https://docs.spring.io/spring-cli/reference/0.9.0
• 0.10.0-SNAPSHOT: https://docs.spring.io/spring-cli/reference/0.10-SNAPSHOT/