minor symfony#27781 Respect alpha order in UPGRADE-4.2 file (ogizanagi)

This PR was merged into the 4.2-dev branch.

Discussion
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Respect alpha order in UPGRADE-4.2 file

| Q             | A
| ------------- | ---
| Branch?       | master <!-- see below -->
| 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?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | N/A   <!-- #-prefixed issue number(s), if any -->
| License       | MIT
| Doc PR        | N/A

Commits
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d5c1cc0 Respect alpha order in UPGRADE-4.2 file

Author: fabpot

UPGRADE-4.2.md

@@ -6,10 +6,21 @@ Cache
 
  * Deprecated `CacheItem::getPreviousTags()`, use `CacheItem::getMetadata()` instead.
 
+Config
+------
+
+ * Deprecated constructing a `TreeBuilder` without passing root node information.
+
+DoctrineBridge
+--------------
+
+ * The `lazy` attribute on `doctrine.event_listener` tags was removed.
+   Listeners are now lazy by default. So any `lazy` attributes can safely be removed from those tags.
+
 Form
 ----
 
- * Deprecated calling `FormRenderer::searchAndRenderBlock` for fields which were already rendered. 
+ * Deprecated calling `FormRenderer::searchAndRenderBlock` for fields which were already rendered.
    Instead of expecting such calls to return empty strings, check if the field has already been rendered.
 
    Before:
@@ -26,11 +37,6 @@ Form
    {% endfor %}
    ```
 
-Config
-------
-
- * Deprecated constructing a `TreeBuilder` without passing root node information.
-
 Security
 --------
 
@@ -58,9 +64,3 @@ Serializer
 
  * Relying on the default value (false) of the "as_collection" option is deprecated since 4.2.
    You should set it to false explicitly instead as true will be the default value in 5.0.
-
-DoctrineBridge
---------------
-
- * The `lazy` attribute on `doctrine.event_listener` tags was removed. 
-   Listeners are now lazy by default. So any `lazy` attributes can safely be removed from those tags.