[PATCH 3/3] Add version info on domaincaps doc

[Sebastian Mitterle]

1. Add 'since 5.10' as commonly used in formatdomain to avoid
   misunderstandings if element is not present (Is it not supported
   because of my version or because of my environment?)

Signed-off-by: Sebastian Mitterle <smitterl at redhat.com>
---
 docs/formatdomaincaps.html.in | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/docs/formatdomaincaps.html.in b/docs/formatdomaincaps.html.in
index 4056e0bd31..70b1d2a8f9 100644
--- a/docs/formatdomaincaps.html.in
+++ b/docs/formatdomaincaps.html.in
@@ -561,7 +561,8 @@
 
     <p>Reports whether the hypervisor will obey the <backingStore>
     elements configured for a <disk> when booting the guest, hotplugging
-    the disk to a running guest, or similar.
+    the disk to a running guest, or similar, <span class="since">since 5.10
+    </span>.
     </p>
 
     <h4><a id="featureBackup">backup</a></h4>
-- 
2.25.2