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svn:author
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jhb
K 8
svn:date
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2018-08-12T01:54:05.192787Z
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V 416
Add an overview section to bus_dma.9.

Describe the role of tags and mapping objects as abstractions.
Describe static vs dynamic transaction types and give a brief overview
of the set of functions and object life cycles used for static vs
dynamic.

While here, fix a few other typos and expand a bit on parent tags.

Reviewed by:	cem, imp
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D16652

END