[PATCH] Documentation: DMA-API: fix a function name of max_mapping_size

[Yoshihiro Shimoda]

Hi Christoph,

> From: Christoph Hellwig, Sent: Friday, June 7, 2019 5:08 PM
> 
> Looks good.  And it seems like you've also found the solution to
> your usb storage problem, but I'm going to post the variant I just
> hacked up nevertheless.

Thank you for your reply! I think this API is related to my problem,
but I don't have any actual solution (a patch) for now. So, I'll wait
for your patch!

Best regards,
Yoshihiro Shimoda