minor #10367 [Yaml] Documenting support for multiple files or directories (yceruto, javiereguiluz)

This PR was merged into the master branch.

Discussion
----------

[Yaml] Documenting support for multiple files or directories

See symfony/symfony#28521

Commits
-------

23f6465 Added the versionadded directive
6cf8bef typo
a5546a6 adding missing "or"
1513f22 Added support for multiple files or directories

Author: javiereguiluz

components/yaml.rst

@@ -410,13 +410,22 @@ Then, execute the script for validating contents:
 
     # validates a single file
     $ php lint.php path/to/file.yaml
+    
+    # or validates multiple files
+    $ php lint.php path/to/file1.yaml path/to/file2.yaml 
 
     # or all the files in a directory
     $ php lint.php path/to/directory
+    
+    # or all the files in multiple directories
+    $ php lint.php path/to/directory1 path/to/directory2
 
     # or contents passed to STDIN
     $ cat path/to/file.yaml | php lint.php
 
+.. versionadded:: 4.2
+    The feature to lint multiple files and directories was introduced in Symfony 4.2.
+
 The result is written to STDOUT and uses a plain text format by default.
 Add the ``--format`` option to get the output in JSON format: