minor #31372 Merges second DI section into first one (jschaedl)

This PR was merged into the 4.3-dev branch.

Discussion
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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     <!-- see https://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
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826237a Merges second DI section into first one

UPGRADE-5.0.md

@@ -55,6 +55,19 @@ DependencyInjection
 
  * Removed the `TypedReference::canBeAutoregistered()` and  `TypedReference::getRequiringClass()` methods.
  * Removed support for auto-discovered extension configuration class which does not implement `ConfigurationInterface`.
+ * Removed support for non-string default env() parameters
+
+   Before:
+   ```yaml
+   parameters:
+        env(NAME): 1.5
+   ```
+
+   After:
+   ```yaml
+   parameters:
+        env(NAME): '1.5'
+   ```
 
 DoctrineBridge
 --------------
@@ -82,23 +95,6 @@ EventDispatcher
  * The signature of the `EventDispatcherInterface::dispatch()` method has been updated to `dispatch($event, string $eventName = null)`
  * The `Event` class has been removed, use `Symfony\Contracts\EventDispatcher\Event` instead
 
-DependencyInjection
--------------------
-
- * Removed support for non-string default env() parameters
-
-   Before:
-   ```yaml
-   parameters:
-       env(NAME): 1.5
-   ```
-
-   After:
-   ```yaml
-   parameters:
-          env(NAME): '1.5'
-   ```
-
 Filesystem
 ----------