[system-administrators-guide] Add link to: Kernel Crash Dump Guide

[stephenw]

commit 95598c4552e4bcb86812fccf297e7696a21d0a7d
Author: Stephen Wadeley <swadeley at redhat.com>
Date:   Tue Dec 9 18:23:11 2014 +0100

    Add link to: Kernel Crash Dump Guide

 en-US/Manually_Upgrading_the_Kernel.xml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/en-US/Manually_Upgrading_the_Kernel.xml b/en-US/Manually_Upgrading_the_Kernel.xml
index 3736442..cd27290 100644
--- a/en-US/Manually_Upgrading_the_Kernel.xml
+++ b/en-US/Manually_Upgrading_the_Kernel.xml
@@ -427,7 +427,7 @@ vmlinuz-3.17.3-200.fc20.x86_64</screen>
         <important id="important-initrd_files_in_the__boot_directory_are_not_the_same_as_initramfs_files">
           <title>initrd files in the /boot/ directory are not the same as initramfs files</title>
           <para>
-            In the <filename class="directory">/boot/</filename> directory you might find several <filename>initrd-<replaceable>kernel_version</replaceable>kdump.img</filename> files. These are special files created by the <systemitem class="service">kdump</systemitem> mechanism for kernel debugging purposes, are not used to boot the system, and can safely be ignored. For more information on <systemitem class="service">kdump</systemitem>, refer to <xref linkend="ch-kdump" />.
+            In the <filename class="directory">/boot/</filename> directory you might find several <filename>initrd-<replaceable>kernel_version</replaceable>kdump.img</filename> files. These are special files created by the <systemitem class="service">kdump</systemitem> mechanism for kernel debugging purposes, are not used to boot the system, and can safely be ignored. For more information on <systemitem class="service">kdump</systemitem>, see the <ulink url="https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Kernel_Crash_Dump_Guide/">Red&nbsp;Hat Enterprise&nbsp;Linux&nbsp;7 Kernel Crash Dump Guide</ulink>.
           </para>
         </important>
       </step>