changed yum to dnf

Author: yakirwin

book/04-git-server/sections/gitweb.asc

@@ -30,7 +30,7 @@ $ git instaweb --httpd=webrick --stop
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 If you want to run the web interface on a server all the time for your team or for an open source project you're hosting, you'll need to set up the CGI script to be served by your normal web server.
-Some Linux distributions have a `gitweb` package that you may be able to install via `apt` or `yum`, so you may want to try that first.
+Some Linux distributions have a `gitweb` package that you may be able to install via `apt` or `dnf`, so you may want to try that first.
 We'll walk through installing GitWeb manually very quickly.
 First, you need to get the Git source code, which GitWeb comes with, and generate the custom CGI script: