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getprogname.3: Add an example

Description

getprogname.3: Add an example

It shows the difference between getprogname() and argv[0].

Reviewed by: yuripv
Approved by: yuripv (src)
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D27204

(cherry picked from commit 1ffdcdadf61423dd02ddad82fc4f3f6c39090c8c)

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