fix misspelling of "configuration"

Change-Id: Iba1040e242f015eb32651efd935ccea3514c80bc

releasenotes/notes/support-check-and-diff-mode-for-genconfig-97703a2ed13ab9ec.yaml

 ---
 features:
   - |
-    Support ansible check and diff module for generate configrations. You could
+    Support ansible check and diff module for generate configurations. You could
     use ``EXTRA_OPTS='--check --diff' kolla-ansible genconfig`` to check what
     the configration file will be like in dry-run mode.