docs: update var name

pkg/client/client.go

@@ -37,7 +37,7 @@ func WithTimeout(timeout int) Opt {
 // New initiates a new Docker client. New client connections are validated so
 // that we ensure connections via SSH to the daemon can succeed. It takes into
 // account that you may only want the local client and not communicate via SSH.
-// For this use-case, please pass "default" as the contextName.
+// For this use-case, please pass "default" as the serverName.
 func New(serverName string, opts ...Opt) (*client.Client, error) {
 	var clientOpts []client.Opt