weak guide

@hgfeaon commented on [Wed Jun 12 2019](https://github.com/gradle-guides/building-spring-boot-2-projects-with-gradle/issues/12)

1. why this guide mention the un-necessary concepts like build-scan, is it a right thing to expose the build info to the public network when the gradle used in-house software development
2. the dependency with the bom example is very ugly

Start by reading the linked guide, building-spring-boot-2-projects-with-gradle, and locate its build-scan and BOM dependency sections. Review whether the guide should explain or remove those concepts and improve the dependency example; done means the guide addresses both concerns clearly.

Written by the indexing model from the issue text.