minor symfony#11986 [Routing] Be consistent in custom route loader doc (fancyweb)

This PR was merged into the 4.3 branch.

Discussion
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[Routing] Be consistent in custom route loader doc

To be consistent with the above name "The routes defined using service route loaders will be automatically..." + cf symfony/symfony#32598 (comment)

Commits
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d60e4f6 [Routing] Be consistent in custom route loader doc

Author: javiereguiluz

routing/custom_route_loader.rst

@@ -139,8 +139,8 @@ extend or implement any special class, but the called method must return a
 
 .. versionadded:: 4.3
 
-    The support of the ``__invoke()`` method to create invokable route loader
-    services was introduced in Symfony 4.3.
+    The support of the ``__invoke()`` method to create invokable service route
+    loaders was introduced in Symfony 4.3.
 
 Creating a custom Loader
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