K 10
svn:author
V 4
ngie
K 8
svn:date
V 27
2017-03-23T05:26:44.203018Z
K 7
svn:log
V 268
intro(3): fix markup

- Use `Em` with `.It` macro when referring to other libraries, instead of
  `Xr`.
- Use `.Em` instead of `.Xr` when referring to libraries.
- Remove commented out lines.

MFC after:	1 month
Reported by:	make manlint
Sponsored by:	Dell EMC Isilon

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