static DocServiceFilter ofServiceName(String serviceName) {
        requireNonNull(serviceName, "serviceName");
        return (plugin, service, method) -> serviceName.equals(service);
    }
Returns a {@link DocServiceFilter} which returns {@code true} when the name of the service matches the
specified {@code serviceName}.
core/src/main/java/com/linecorp/armeria/server/docs/DocServiceFilter.java