changed yum to dnf across all the file examples

Author: yakirwin

book/01-introduction/sections/installing.asc

@@ -15,11 +15,11 @@ Since Git is quite excellent at preserving backwards compatibility, any version
 
 (((Linux, installing)))
 If you want to install the basic Git tools on Linux via a binary installer, you can generally do so through the basic package-management tool that comes with your distribution.
-If you're on Fedora for example, you can use yum:
+If you're on Fedora for example, you can use dnf:
 
 [source,console]
 ----
-$ sudo yum install git-all
+$ sudo dnf install git-all
 ----
 
 If you're on a Debian-based distribution like Ubuntu, try apt-get:
@@ -71,11 +71,11 @@ Some people may instead find it useful to install Git from source, because you'l
 The binary installers tend to be a bit behind, though as Git has matured in recent years, this has made less of a difference.
 
 If you do want to install Git from source, you need to have the following libraries that Git depends on: autotools, curl, zlib, openssl, expat, and libiconv.
-For example, if you're on a system that has yum (such as Fedora) or apt-get (such as a Debian based system), you can use one of these commands to install the minimal dependencies for compiling and installing the Git binaries:
+For example, if you're on a system that has dnf (such as Fedora) or apt-get (such as a Debian based system), you can use one of these commands to install the minimal dependencies for compiling and installing the Git binaries:
 
 [source,console]
 ----
-$ sudo yum install dh-autoreconf curl-devel expat-devel gettext-devel \
+$ sudo dnf install dh-autoreconf curl-devel expat-devel gettext-devel \
   openssl-devel perl-devel zlib-devel
 $ sudo apt-get install dh-autoreconf libcurl4-gnutls-dev libexpat1-dev \
   gettext libz-dev libssl-dev
@@ -85,7 +85,7 @@ In order to be able to add the documentation in various formats (doc, html, info
 
 [source,console]
 ----
-$ sudo yum install asciidoc xmlto docbook2X getopt
+$ sudo dnf install asciidoc xmlto docbook2X getopt
 $ sudo apt-get install asciidoc xmlto docbook2x getopt
 ----