Merge pull request #3716 from BenTheElder/cleanup-deprecated

cleanup long-deprecated flags

site/content/docs/user/known-issues.md

@@ -127,11 +127,11 @@ Flags:
       --base-image string   name:tag of the base image to use for the build (default "kindest/base:v20181203-d055041")
   -h, --help                help for node-image
       --image string        name:tag of the resulting image to be built (default "kindest/node:latest")
-      --kube-root string    Path to the Kubernetes source directory (if empty, the path is autodetected)
       --type string         build type, default is docker (default "docker")
 
 Global Flags:
-      --loglevel string   logrus log level [panic, fatal, error, warning, info, debug] (default "warning")
+  -q, --quiet             silence all stderr output
+  -v, --verbosity int32   info log verbosity, higher value produces more output
 
 error building node image: failed to build kubernetes: failed to build images: exit status 2
 ```

site/content/docs/user/working-offline.md

@@ -109,7 +109,7 @@ You can clone Kubernetes source code.
 ### Building image
 
 ```sh
-➜  ~ kind build node-image --image kindest/node:main --kube-root $GOPATH/src/k8s.io/kubernetes 
+➜  ~ kind build node-image --image kindest/node:main $GOPATH/src/k8s.io/kubernetes 
 Starting to build Kubernetes
 ...
 Image build completed.