Merge pull requests #10892, #10893, #10896, #10897 from Buzzardo

* pr/10892:
  Format production-ready-features.adoc to 90 chars
  Format spring-boot-features.adoc to 90 chars
  Format using-spring-boot.adoc to 90 chars
  Format getting-started.adoc to 90 chars

Author: philwebb