releasenotes: Fix typo

Stephen asked nicely[1] on the review to fix this in a follow-up.  (I
guess it's because release notes are public, and it's nice not to have
typos in them.)

[1] https://review.opendev.org/c/openstack/nova/+/780908/1/releasenotes/notes/deprecate-tunnelled-live-migration-81c06a04627724ec.yaml

Change-Id: Ifc80421c1bed4cf1619814b5c78c5c39d9f031b2
Signed-off-by: Kashyap Chamarthy <[email protected]>

Author: kashyapc

releasenotes/notes/deprecate-tunnelled-live-migration-81c06a04627724ec.yaml

@@ -13,4 +13,4 @@ deprecations:
     -- this is the recommended approach for securing all live migration
     streams (guest RAM, device state, and disks).  Assuming TLS
     environment is setup, this can be enabled by setting the config
-    attribiute ``[libvirt]live_migration_with_native_tls``.
+    attribute ``[libvirt]live_migration_with_native_tls``.