Fix some typos (#3302)

Signed-off-by: mooncake <[email protected]>

docs/contributors/adding_driver.md

@@ -10,7 +10,7 @@ create a new docker machine driver.
 First of all, before started, you need to understand your driver in terms of:
 
 - Which operating system is your driver running on?
-- Is your driver builtin the minikube binary or triggerred through RPC?
+- Is your driver builtin the minikube binary or triggered through RPC?
 - How to translate minikube config to driver config?
 - If builtin, how to instantiate the driver instance?
 

pkg/minikube/registry/registry.go

@@ -60,7 +60,7 @@ type DriverDef struct {
 	Name string
 
 	// BuiltIn indicates if the driver is builtin minikube binary, or the driver is
-	// triggerred through RPC.
+	// triggered through RPC.
 	Builtin bool
 
 	// ConfigCreator generate a raw driver object by minikube's machine config.

pkg/util/kubeconfig/config.go

@@ -220,7 +220,7 @@ func decode(data []byte) (*api.Config, error) {
 	return config.(*api.Config), nil
 }
 
-// GetKubeConfigStatus verifys the ip stored in kubeconfig.
+// GetKubeConfigStatus verifies the ip stored in kubeconfig.
 func GetKubeConfigStatus(ip net.IP, filename string, machineName string) (bool, error) {
 	if ip == nil {
 		return false, fmt.Errorf("Error, empty ip passed")