[PATCH 6/5] docs: Typo fix in live disk backup

[Eric Blake <eblake@redhat.com>]

Add in the missing space in the section header.

Fixes: 1084159b31 ("qapi: deprecate drive-backup", v6.2.0)
Signed-off-by: Eric Blake <eblake@redhat.com>

---

Noticed while figuring out where nbd docs would appear in [1] once [2]
goes live:
[1] https://www.qemu.org/docs/master/interop/index.html
[2] https://lists.gnu.org/archive/html/qemu-devel/2024-08/msg00223.html

---
 docs/interop/live-block-operations.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/interop/live-block-operations.rst b/docs/interop/live-block-operations.rst
index 691429c7afe..6b549ede7c9 100644
--- a/docs/interop/live-block-operations.rst
+++ b/docs/interop/live-block-operations.rst
@@ -931,8 +931,8 @@ Shutdown the guest, by issuing the ``quit`` QMP command::
     }


-Live disk backup --- ``blockdev-backup`` and the deprecated``drive-backup``
----------------------------------------------------------------------------
+Live disk backup --- ``blockdev-backup`` and the deprecated ``drive-backup``
+----------------------------------------------------------------------------

 The ``blockdev-backup`` (and the deprecated ``drive-backup``) allows
 you to create a point-in-time snapshot.
-- 
2.45.2