Close file after using it (#59000)

lib/ansible/parsing/plugin_docs.py

@@ -90,12 +90,12 @@ def read_docstub(filename):
     operations like ansible-doc -l.
     """
 
-    t_module_data = open(filename, 'r')
     in_documentation = False
     capturing = False
     indent_detection = ''
     doc_stub = []
 
+    with open(filename, 'r') as t_module_data:
         for line in t_module_data:
             if in_documentation:
                 # start capturing the stub until indentation returns