Update API reference paths for v1.9 (kubernetes#6681)

Author: zacharysarah

_redirects

@@ -77,8 +77,9 @@
 /docs/api-reference/v1.6/*     https://v1-6.docs.kubernetes.io/docs/reference/ 301
 /docs/api-reference/v1.7/*     https://v1-7.docs.kubernetes.io/docs/reference/ 301
 /docs/api-reference/v1.8/*     https://v1-8.docs.kubernetes.io/docs/reference/ 301
-/docs/api-reference/v1/definitions/     /docs/api-reference/v1.8/ 301
-/docs/api-reference/v1/operations/     /docs/api-reference/v1.8/ 301
+/docs/api-reference/v1/definitions/     /docs/api-reference/v1.9/ 301
+/docs/api-reference/v1/operations/     /docs/api-reference/v1.9/ 301
+
 
 /docs/concepts/abstractions/controllers/garbage-collection/     /docs/concepts/workloads/controllers/garbage-collection/ 301
 /docs/concepts/abstractions/controllers/petsets/     /docs/concepts/workloads/controllers/statefulset/ 301