[install-guide/f21-branch] clearpart --all wipes ALL, including attached network storage

[pbokoc]

commit a95452002df2c7524b29e398c76d8ce3ea0ad574
Author: Petr Bokoc <pbokoc at redhat.com>
Date:   Tue Dec 9 18:43:13 2014 +0100

    clearpart --all wipes ALL, including attached network storage

 en-US/Kickstart_Syntax_Reference.xml |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/en-US/Kickstart_Syntax_Reference.xml b/en-US/Kickstart_Syntax_Reference.xml
index 1f6b450..1955bb0 100644
--- a/en-US/Kickstart_Syntax_Reference.xml
+++ b/en-US/Kickstart_Syntax_Reference.xml
@@ -797,6 +797,11 @@
                         <para>
                             Erases all partitions from the system.
                         </para>
+                        <warning>
+                        	<para>
+                        		This option will erase all disks which can be reached by the installer, including any attached network storage. Use this option with caution.
+                        	</para>
+                        </warning>
                     </listitem>
                 </varlistentry>
                 <varlistentry>