Fix PretrainedConfig docstring with deprecated resume_download (#31014)

src/transformers/configuration_utils.py

@@ -536,9 +536,9 @@ class PretrainedConfig(PushToHubMixin):
             force_download (`bool`, *optional*, defaults to `False`):
                 Whether or not to force to (re-)download the configuration files and override the cached versions if
                 they exist.
-            resume_download (`bool`, *optional*, defaults to `False`):
-                Whether or not to delete incompletely received file. Attempts to resume the download if such a file
-                exists.
+            resume_download:
+                Deprecated and ignored. All downloads are now resumed by default when possible.
+                Will be removed in v5 of Transformers.
             proxies (`Dict[str, str]`, *optional*):
                 A dictionary of proxy servers to use by protocol or endpoint, e.g., `{'http': 'foo.bar:3128',
                 'http://hostname': 'foo.bar:4012'}.` The proxies are used on each request.