docs(admin): Rename a left-over mention of max_chunk_size

The setting is now files.chunked_upload.max_size, which was already
changed in a previous occurrence in this file.

Signed-off-by: Pablo Zmdl <[email protected]>

Author: pabzm

admin_manual/configuration_files/big_file_upload_configuration.rst

@@ -165,7 +165,7 @@ Put in a value in bytes (in this example, 20MB). Set ``--value 0`` for no chunki
 
 Default is ``104857600`` (100 MiB).
 
-.. note:: Changing ``max_chunk_size`` will not have any performance impact on files uploaded through File Drop shares as unauthenticated file uploads are not chunked.
+.. note:: Changing ``files.chunked_upload.max_size`` will not have any performance impact on files uploaded through File Drop shares as unauthenticated file uploads are not chunked.
 
 Large file upload on object storage
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