Revert "Revert "Update cobra/pflag. Also update generated kubectl documentation.""

This reverts commit 69432e8b2f.

    COMMIT_BLOCKED_ON_GENDOCS

docs/kubectl-config-unset.md

@@ -12,6 +12,12 @@ PROPERTY_NAME is a dot delimited name where each token represents either a attri
 kubectl config unset PROPERTY_NAME
 ```
 
+### Options
+
+```
+  -h, --help=false: help for unset
+```
+
 ### Options inherrited from parent commands
 
 ```
@@ -25,7 +31,6 @@ kubectl config unset PROPERTY_NAME
       --context="": The name of the kubeconfig context to use
       --envvar=false: use the .kubeconfig from $KUBECONFIG
       --global=false: use the .kubeconfig from /home/username
-  -h, --help=false: help for config
       --insecure-skip-tls-verify=false: If true, the server's certificate will not be checked for validity. This will make your HTTPS connections insecure.
       --kubeconfig="": use a particular .kubeconfig file
       --local=false: use the .kubeconfig in the current directory