Use -delete in EXAMPLES

-delete is part of POSIX since 2001 and tedu added support for it in 2012,
-print0 however never made it into any standard, so replace this less
portable idiom with its more concise built-in counterpart.

Both -print0 as well as xargs(1) -0 explain and reference each other and
CAVEATS goes into detail with problematic file names, so no information
is lost by replacing this particular example.

While here, make the -exec example rm(1) multiple files at once.

Feedback from claudio tb
Input and OK millert

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