document of parameter buffer_size in MaxTokenBucketizer is wrong

[ling0322]

According to the document MaxTokenBucketizer buffer_size – This restricts how many tokens are taken from prior DataPipe to bucketize

However, in the code, bucketbatcher.py#L277 The unit of buffer_size is sample not token

[ejguan]

Thanks for reporting it. Feel free to open a PR to fix the inline doc.