Missing annotations (kubernetes#8288)

Not quite sure but It seems that `nginx.ingress.kubernetes.io/canary-by-header` is missing.

docs/user-guide/nginx-configuration/annotations.md

@@ -134,7 +134,7 @@ In some cases, you may want to "canary" a new set of changes by sending a small
 
 * `nginx.ingress.kubernetes.io/canary-by-header`: The header to use for notifying the Ingress to route the request to the service specified in the Canary Ingress. When the request header is set to `always`, it will be routed to the canary. When the header is set to `never`, it will never be routed to the canary. For any other value, the header will be ignored and the request compared against the other canary rules by precedence.
 
-* `nginx.ingress.kubernetes.io/canary-by-header-value`: The header value to match for notifying the Ingress to route the request to the service specified in the Canary Ingress. When the request header is set to this value, it will be routed to the canary. For any other header value, the header will be ignored and the request compared against the other canary rules by precedence. This annotation has to be used together with . The annotation is an extension of the `nginx.ingress.kubernetes.io/canary-by-header` to allow customizing the header value instead of using hardcoded values. It doesn't have any effect if the `nginx.ingress.kubernetes.io/canary-by-header` annotation is not defined.
+* `nginx.ingress.kubernetes.io/canary-by-header-value`: The header value to match for notifying the Ingress to route the request to the service specified in the Canary Ingress. When the request header is set to this value, it will be routed to the canary. For any other header value, the header will be ignored and the request compared against the other canary rules by precedence. This annotation has to be used together with `nginx.ingress.kubernetes.io/canary-by-header`. The annotation is an extension of the `nginx.ingress.kubernetes.io/canary-by-header` to allow customizing the header value instead of using hardcoded values. It doesn't have any effect if the `nginx.ingress.kubernetes.io/canary-by-header` annotation is not defined.
 
 * `nginx.ingress.kubernetes.io/canary-by-header-pattern`: This works the same way as `canary-by-header-value` except it does PCRE Regex matching. Note that when `canary-by-header-value` is set this annotation will be ignored. When the given Regex causes error during request processing, the request will be considered as not matching.