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2022-04-18T11:13:46.480895Z
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df(1): Add EXAMPLES section to man page

* Add EXAMPLES section with four simple examples.
* Simplify -H flag description. This makes easy to see the difference between
  this flag and -h
* While here, fix .Tn deprecated macro.

Approved by:	manpages (bcr@)
Differential Revision:	https://reviews.freebsd.org/D26662

(cherry picked from commit ad3d2e7e4a18575f825b65a19e49720a513d2343)

Git Hash:   ca5f7b7a320ea259d6a0b6c498f6c73f0a5f92b3
Git Author: fernape@FreeBSD.org
END