extensions: Fix metainfo example so that it validates correctly

docs/extension.rst

@@ -359,27 +359,31 @@ stores. This is a typical example of an extension MetaInfo file.
 .. code-block:: xml
 
  <?xml version="1.0" encoding="UTF-8"?>
- <component type="addon">
- <id>org.flatpak.app.plugin.foo</id>
- <extends>org.flatpak.app</extends>
- <name>Foo</name>
- <summary>A nice summary</summary>
- <project_license>GPL-2.0</project_license>
- <metadata_license>CC0-1.0</metadata_license>
- <developer_name>Bar</developer_name>
- <url type="homepage">https://flatpak.github.io/</url>
- <update_contact>bar_AT_example.org</update_contact>
- <releases>
+ <component type="addon">
+ <id>org.flatpak.app.plugin.foo</id>
+ <extends>org.flatpak.app</extends>
+ <name>Foo</name>
+ <summary>A nice summary</summary>
+ <project_license>GPL-2.0-only</project_license>
+ <metadata_license>CC0-1.0</metadata_license>
+ <developer id="com.example">
+ <name>Bar</name>
+ </developer>
+ <url type="homepage">https://flatpak.github.io/</url>
+ <update_contact>bar_AT_example.org</update_contact>
+ <releases>
  <release version="1.2.0" date="2023-12-03">
- <description>
+ <description>
+ <p>Release description</p>
  <ul>
  <li>A release note</li>
  <li>A bugfix</li>
  </ul>
  </description>
+ </release>
  <release version="1.0.0" date="2020-04-20"/>
-  </releases>
-  </component>
+ </releases>
+ </component>
 
 Unmaintained Flatpak extensions
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