Log Message:
- re-adjust sentence widths, and put new sentences on new lines;
- add an appropriate comma;
- correct (also macro wise) / rewrite `EXAMPLES' section;
- replace packages(7) reference in `SEE ALSO' with pkgsrc(7) one
  (src/share/man/man7/packages.7 was removed in 2007);
- remove ``Documentation on the NetBSD Package System'' reference
  from `SEE ALSO' (it's referenced in pkgsrc(7));
- remove unneccesary `.br' macro (and low level macros should
  generally not be used anyway);
- remove `BUGS' section, as the ``bug'' described in it isn't a
  bug at all;
- bump date.

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