minor #41145 Fix style of changelogs/readmes (nicolas-grekas)

This PR was merged into the 5.3-dev branch.

Discussion
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Fix style of changelogs/readmes

| Q             | A
| ------------- | ---
| Branch?       | 5.3
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

Commits
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a964554538 Fix style of changelogs/readmes

src/Symfony/Bundle/TwigBundle/CHANGELOG.md

@@ -1,10 +1,10 @@
 CHANGELOG
 =========
 
-5.3.0
------
+5.3
+---
 
-* Added support for the new `serialize` filter (from Twig Bridge)
+ * Add support for the new `serialize` filter (from Twig Bridge)
 
 5.2.0
 -----

src/Symfony/Component/Notifier/Bridge/Octopush/README.md

@@ -15,6 +15,7 @@ where:
  - `APIKEY` is your Octopush token
  - `FROM` is your sender
  - `TYPE` is Octopush sms type (`XXX` = SMS LowCost; `FR` = SMS Premium; `WWW` = SMS World)
+
 Resources
 ---------