This PR was merged into the 4.3-dev branch.Discussion----------Merges second DI section into first one| Q             | A| ------------- | ---| Branch?       | master| Bug fix?      | no| New feature?  | no <!-- don't forget to update src/**/CHANGELOG.md files -->| BC breaks?    | no     <!-- seehttps://symfony.com/bc -->| Deprecations? | no <!-- don't forget to update UPGRADE-*.md and src/**/CHANGELOG.md files -->| Tests pass?   | not related    <!-- please add some, will be required by reviewers -->| Fixed tickets | -  <!-- #-prefixed issue number(s), if any -->| License       | MIT| Doc PR        | -Commits-------826237a Merges second DI section into first one