minor symfony#9208 Fix references to annotation loader tip (maff)

This PR was merged into the 2.7 branch.

Discussion
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Fix references to annotation loader tip

Tips were refactored to an include file in 0ddf3d2 but referenced the wrong filename. a0b19c3 removed the wrong tip from the serializer page.

This fixes the tip references on routing/validator and restores the tip on the serializer, but with the right reference.

Commits
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1f422cf Fix references to annotation loader tip

Author: javiereguiluz

components/routing.rst

@@ -312,7 +312,7 @@ Last but not least there are
 route definitions from class annotations. The specific details are left
 out here.
 
-.. include:: /_includes/_rewrite_rule_tip.rst.inc
+.. include:: /_includes/_annotation_loader_tip.rst.inc
 
 The all-in-one Router
 ~~~~~~~~~~~~~~~~~~~~~

components/serializer.rst

@@ -310,6 +310,8 @@ You are now able to serialize only attributes in the groups you want::
     );
     // $obj2 = MyObj(foo: 'foo', bar: 'bar')
 
+.. include:: /_includes/_annotation_loader_tip.rst.inc
+
 .. _ignoring-attributes-when-serializing:
 
 Ignoring Attributes

components/validator/resources.rst

@@ -119,7 +119,7 @@ method. It takes an optional annotation reader instance, which defaults to
 To disable the annotation loader after it was enabled, call
 :method:`Symfony\\Component\\Validator\\ValidatorBuilder::disableAnnotationMapping`.
 
-.. include:: /_includes/_rewrite_rule_tip.rst.inc
+.. include:: /_includes/_annotation_loader_tip.rst.inc
 
 Using Multiple Loaders
 ----------------------