[Bug 253470] documentation/content/en/books/fdp-primer/tools/chapter.adoc: Fix package name

[Ceri Davies]

There’s another typo on that line: “as showed” vs “as shown”.  

Ceri 

> On 12 Feb 2021, at 21:39, bugzilla-noreply at freebsd.org wrote:
> 
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253470
> 
> Daniel Ebdrup Jensen <debdrup at freebsd.org> changed:
> 
>           What    |Removed                     |Added
> ----------------------------------------------------------------------------
>           Assignee|doc at FreeBSD.org             |debdrup at freebsd.org
>             Status|New                         |Open
>                 CC|                            |debdrup at freebsd.org
> 
> --- Comment #1 from Daniel Ebdrup Jensen <debdrup at freebsd.org> ---
> I'll take this.
> 
> Are you okay with being credited via --author="Yasuhiro Kimura
> <yasu at utahime.org>" ?
> 
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