Added support for multiple files or directories

Author: yceruto

components/yaml.rst

@@ -410,9 +410,15 @@ Then, execute the script for validating contents:
 
     # validates a single file
     $ php lint.php path/to/file.yaml
+    
+    # validates a 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