docs: Add missing encryption type

Update the text to include "luks" as a possible value.

diff --git a/docs/formatstorageencryption.html.in b/docs/formatstorageencryption.html.in
index c4b2095270f3b278ea50ea07eb40ffadf18f5a0d..23efbf932e6568424e78d3027d85a87bee75834f 100644 (file)
--- a/docs/formatstorageencryption.html.in
+++ b/docs/formatstorageencryption.html.in
@@ -17,7 +17,8 @@
       The top-level tag of volume encryption specification
       is <code>encryption</code>, with a mandatory
       attribute <code>format</code>.  Currently defined values
-      of <code>format</code> are <code>default</code> and <code>qcow</code>.
+      of <code>format</code> are <code>default</code>, <code>qcow</code>,
+      and <code>luks</code>.
       Each value of <code>format</code> implies some expectations about the
       content of the <code>encryption</code> tag.  Other format values may be
       defined in the future.