docs/115571: Use mount -t msdosfs instead of mount_msdosfs in the handbook

[Gabor Kovesdan]

Craig Rodrigues escribió:
> Hi,
>
> In addition to changing the Handbook, I also recommend
> patching the msdosfs(5) man page.
>   
Hello,

thanks for your note! I just wrote to re@ for approval. Afaik, this 
change only applies to HEAD or should I MFC it to RELENG_6?
Btw, you forgot to bump .Dd.

Thanks,

-- 
Gabor Kovesdan
FreeBSD Volunteer

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