Release notes were calculated since v1.17.2

Signed-off-by: Richard Wall <[email protected]>

Author: wallrj-cyberark

content/docs/releases/release-notes/release-notes-1.18.md

@@ -129,7 +129,7 @@ And finally, thanks to the cert-manager steering committee for their feedback in
 
 ## `v1.18.0`
 
-Changes since `v1.17.0`:
+Changes since `v1.17.2`:
 
 ### Feature