Update of mmap_mode description (joblib#1203)

Co-authored-by: Olivier Grisel <[email protected]>

joblib/parallel.py

@@ -614,12 +614,15 @@ class Parallel(Logger):
  in Bytes, or a human-readable string, e.g., '1M' for 1 megabyte.
  Use None to disable memmapping of large arrays.
  Only active when backend="loky" or "multiprocessing".
- mmap_mode: {None, 'r+', 'r', 'w+', 'c'}
+ mmap_mode: {None, 'r+', 'r', 'w+', 'c'}, default: 'r'
  Memmapping mode for numpy arrays passed to workers.
- See 'max_nbytes' parameter documentation for more details.
+ None will disable memmapping, other modes defined in the numpy.memmap doc:
+ https://numpy.org/doc/stable/reference/generated/numpy.memmap.html
+ Also, see 'max_nbytes' parameter documentation for more details.
  return_generator: bool
  If True, calls to this instance will return a generator.
 
+
  Notes
  -----