update docs

Author: Priya Wadhwa

site/content/en/docs/commands/config.md

@@ -68,6 +68,42 @@ minikube config SUBCOMMAND [flags]
       --vmodule moduleSpec               comma-separated list of pattern=N settings for file-filtered logging
 ```
 
+## minikube config defaults
+
+Lists all valid default values for PROPERTY_NAME
+
+### Synopsis
+
+list displays all valid default settings for PROPERTY_NAME
+Acceptable fields: 
+
+ * driver
+
+```
+minikube config defaults PROPERTY_NAME [flags]
+```
+
+### Options
+
+```
+  -h, --help            help for defaults
+      --output string   Output format. Accepted values: [json]
+```
+
+### Options inherited from parent commands
+
+```
+      --alsologtostderr                  log to standard error as well as files
+  -b, --bootstrapper string              The name of the cluster bootstrapper that will set up the Kubernetes cluster. (default "kubeadm")
+      --log_backtrace_at traceLocation   when logging hits line file:N, emit a stack trace (default :0)
+      --log_dir string                   If non-empty, write log files in this directory
+      --logtostderr                      log to standard error instead of files
+  -p, --profile string                   The name of the minikube VM being used. This can be set to allow having multiple instances of minikube independently. (default "minikube")
+      --stderrthreshold severity         logs at or above this threshold go to stderr (default 2)
+  -v, --v Level                          log level for V logs
+      --vmodule moduleSpec               comma-separated list of pattern=N settings for file-filtered logging
+```
+
 ## minikube config get
 
 Gets the value of PROPERTY_NAME from the minikube config file