Clarify non-config component docs

Previously there were a couple of components that did not have
configuration files by default.  Some of these components _could_ be
configured, but were not by default.  The documentation for these
components indicated that configuration should only be modified.  This
change updates the documentation to mention that the configuration
files may need to be created as well as potentially being updated.

[#63758260]
Merge 63758260-java-main-docs to master

[Completes #63758260]
Support Spring Boot beans-style configuration

This change adds support for Spring Boot's beans-style
configuration[1].

[1]: https://github.com/spring-projects/spring-boot/tree/master/spring-boot-cli#beans-dsl

[#63606834]
Merge 63606834-spring-boot-beans to master

[Completes #63606834]
tweek
Merge branch 'master' of github.com:cloudfoundry/java-buildpack

Conflicts:
	java-buildpack.iml