[Misc] Documentation
[Misc] Improve logging level. This is technical information that doesn't need to be constantly printed in the console when XWiki starts.
Merge branch 'master' of github.com:xwiki/xwiki-platform into feature-distributionwikimode

Conflicts:
	xwiki-platform-core/xwiki-platform-extension/xwiki-platform-extension-distribution/src/main/java/org/xwiki/extension/distribution/internal/DistributionInitializerListener.java