man: break long lines and update Fedora versions

We should try to keep the unbreakable lines below 80 columns.
It's not always possible of course.

Also, use the dl.fp.o alias instead of a specific mirror.

Author: keszybz

man/systemd-nspawn.xml

@@ -346,8 +346,9 @@
         in the container's file system namespace.</para>
 
         <para>This is for containers which have several bootable directories in them; for example, several
-        <ulink url="https://ostree.readthedocs.io/en/latest/">OSTree</ulink> deployments. It emulates the behavior of the boot
-        loader and initial RAM disk which normally select which directory to mount as root and start the container's PID 1 in.</para></listitem>
+        <ulink url="https://ostree.readthedocs.io/en/latest/">OSTree</ulink> deployments. It emulates the behavior of
+        the boot loader and initial RAM disk which normally select which directory to mount as the root and start the
+        container's PID 1 in.</para></listitem>
       </varlistentry>
 
       <varlistentry>
@@ -1041,8 +1042,9 @@
     <example>
       <title>Download a Fedora image and start a shell in it</title>
 
-      <programlisting># machinectl pull-raw --verify=no http://ftp.halifax.rwth-aachen.de/fedora/linux/releases/24/CloudImages/x86_64/images/Fedora-Cloud-Base-24-1.2.x86_64.raw.xz
-# systemd-nspawn -M Fedora-Cloud-Base-24-1.2.x86_64.raw</programlisting>
+      <programlisting># machinectl pull-raw --verify=no \
+      https://download.fedoraproject.org/pub/fedora/linux/releases/25/CloudImages/x86_64/images/Fedora-Cloud-Base-25-1.3.x86_64.raw.xz
+# systemd-nspawn -M Fedora-Cloud-Base-25-1.3.x86_64.raw</programlisting>
 
       <para>This downloads an image using
       <citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
@@ -1052,7 +1054,9 @@
     <example>
       <title>Build and boot a minimal Fedora distribution in a container</title>
 
-      <programlisting># dnf -y --releasever=23 --installroot=/srv/mycontainer --disablerepo='*' --enablerepo=fedora --enablerepo=updates install systemd passwd dnf fedora-release vim-minimal
+      <programlisting># dnf -y --releasever=25 --installroot=/srv/mycontainer \
+      --disablerepo='*' --enablerepo=fedora --enablerepo=updates install \
+      systemd passwd dnf fedora-release vim-minimal
 # systemd-nspawn -bD /srv/mycontainer</programlisting>
 
       <para>This installs a minimal Fedora distribution into the
@@ -1095,13 +1099,16 @@
       <title>Run a container with SELinux sandbox security contexts</title>
 
       <programlisting># chcon system_u:object_r:svirt_sandbox_file_t:s0:c0,c1 -R /srv/container
-# systemd-nspawn -L system_u:object_r:svirt_sandbox_file_t:s0:c0,c1 -Z system_u:system_r:svirt_lxc_net_t:s0:c0,c1 -D /srv/container /bin/sh</programlisting>
+# systemd-nspawn -L system_u:object_r:svirt_sandbox_file_t:s0:c0,c1 \
+      -Z system_u:system_r:svirt_lxc_net_t:s0:c0,c1 -D /srv/container /bin/sh</programlisting>
     </example>
 
     <example>
       <title>Run a container with an OSTree deployment</title>
 
-      <programlisting># systemd-nspawn -b -i ~/image.raw --pivot-root=/ostree/deploy/$OS/deploy/$CHECKSUM:/sysroot --bind=+/sysroot/ostree/deploy/$OS/var:/var</programlisting>
+      <programlisting># systemd-nspawn -b -i ~/image.raw \
+      --pivot-root=/ostree/deploy/$OS/deploy/$CHECKSUM:/sysroot \
+      --bind=+/sysroot/ostree/deploy/$OS/var:/var</programlisting>
     </example>
   </refsect1>