Merge branch '5.3' into 5.4

* 5.3:
  [Validator] Add missing dot
  Use s-maxage instead of max-age for ESI

Author: javiereguiluz

http_cache/esi.rst

@@ -174,9 +174,8 @@ of the main page::
     {
         public function latest($maxPerPage)
         {
-            // ...
-            $response->setPublic();
-            $response->setMaxAge(60);
+            // sets to public and adds some expiration
+            $response->setSharedMaxAge(60);
 
             return $response;
         }

validation.rst

@@ -193,7 +193,7 @@ message:
 .. code-block:: text
 
     Object(App\Entity\Author).name:
-        This value should not be blank
+        This value should not be blank.
 
 If you insert a value into the ``name`` property, the happy success message
 will appear.