FDP: Refer to the proper package name for hugo

The package name 'hugo' refers to emulators/hugo, a PC Engine
(TurboGrafx 16) emulator, whereas the hugo that is required by the new
framework is www/gohugo. A similar case applies with the package name of
AsciiDoctor, which is 'rubygem-asciidoctor'.
Therefore fix package names so they refer to proper ones.

PR:		253470

documentation/content/en/books/fdp-primer/tools/chapter.adoc

@@ -27,7 +27,7 @@ Several software tools are used to manage the FreeBSD documentation and render i
 [[tools-required]]
 == Required Tools
 
-Install `hugo` and `asciidoctor` as showed in the <<overview,the overview chapter>> from the Ports Collection. These applications are required to do useful work with the FreeBSD documentation. Some further notes on particular components are given below.
+Install `gohugo` and `rubygem-asciidoctor` as showed in the <<overview,the overview chapter>> from the Ports Collection. These applications are required to do useful work with the FreeBSD documentation. Some further notes on particular components are given below.
 
 [[tools-optional]]
 == Optional Tools