minor #18877 [Routing] Improve the explanation of the exclude parameter (javiereguiluz)

This PR was squashed before being merged into the 5.4 branch.

Discussion
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[Routing] Improve the explanation of the exclude parameter

Fixes #14507.

Commits
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fe04b38 [Routing] Improve the explanation of the exclude parameter

Author: javiereguiluz

routing.rst

@@ -1670,7 +1670,8 @@ when importing the routes.
             # trailing_slash_on_root: false
 
             # you can optionally exclude some files/subdirectories when loading annotations
-            # exclude: '../../src/Controller/{DebugEmailController}.php'
+            # (the value must be a string or an array of PHP glob patterns)
+            # exclude: '../../src/Controller/{Debug*Controller.php}'
 
     .. code-block:: xml
 
@@ -1685,12 +1686,13 @@ when importing the routes.
                 the 'prefix' value is added to the beginning of all imported route URLs
                 the 'name-prefix' value is added to the beginning of all imported route names
                 the 'exclude' option defines the files or subdirectories ignored when loading annotations
+                (the value must be a PHP glob pattern and you can repeat this option any number of times)
             -->
             <import resource="../../src/Controller/"
                 type="annotation"
                 prefix="/blog"
                 name-prefix="blog_"
-                exclude="../../src/Controller/{DebugEmailController}.php">
+                exclude="../../src/Controller/{Debug*Controller.php}">
                 <!-- these requirements are added to all imported routes -->
                 <requirement key="_locale">en|es|fr</requirement>
             </import>
@@ -1716,7 +1718,8 @@ when importing the routes.
                     false,
                     // the optional fourth argument is used to exclude some files
                     // or subdirectories when loading annotations
-                    '../../src/Controller/{DebugEmailController}.php'
+                    // (the value must be a string or an array of PHP glob patterns)
+                    '../../src/Controller/{Debug*Controller.php}'
                 )
                 // this is added to the beginning of all imported route URLs
                 ->prefix('/blog')