Whitespace fix

Author: darmach

releasenotes/notes/nova-machine-type-q35-ab363c5f7f3f9807.yaml

@@ -2,7 +2,7 @@
 upgrade:
   - |
     Configure Nova to use more modern 'q35' libvirt machine type rather than
-		'pc' which is considered legacy.
+    'pc' which is considered legacy.
   - |
     Configure Nova libvirt.num_pcie_ports to 16 by default. Nova currently
     sets 'num_pcie_ports' to "0" (defaults to libvirt's "1"), which is