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svn:author
V 3
jhb
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svn:date
V 27
2018-09-28T17:40:06.083325Z
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svn:log
V 328
MFC 337673: 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.

END