Update core 8.3.0

web/vendor/zendframework/zend-feed/doc/book/consuming-atom-entry.md

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+# Consuming a Single Atom Entry
+
+Single Atom `<entry>` elements are also valid by themselves. Usually the URL for
+an entry is the feed's URL followed by `/<entryId>`, such as
+`http://atom.example.com/feed/1`, using the example URL we used above. This
+pattern may exist for some web services which use Atom as a container syntax.
+
+If you read a single entry, you will have a `Zend\Feed\Reader\Entry\Atom` object.
+
+## Reading a Single-Entry Atom Feed
+
+```php
+$entry = Zend\Feed\Reader\Reader::import('http://atom.example.com/feed/1');
+echo 'Entry title: ' . $entry->getTitle();
+```
+
+> ## Importing requires an HTTP client
+>
+> To import a feed, you will need to have an [HTTP client](zend.feed.http-clients)
+> available. 
+>
+> If you are not using zend-http, you will need to inject `Reader` with the HTTP
+> client. See the [section on providing a client to Reader](http-clients.md#providing-a-client-to-reader).