Leaflet: How to move the layer-control menu?

According to the docs here, you can pass the position in as an option when creating the layer control.

Available positions are outlined here

overlayPane = {
  "Endpoints" : endpointMarkerLayer,
  "Links" : linkLineLayer,
};

// Add a layer control element to the map
layerControl = L.control.layers(null, overlayPane, {position: 'topleft'});
layerControl.addTo(map);

Kelso's answer is correct. However, the documentation (and API) is a bit confusing. For example, to create a custom info box, based on this example: http://leafletjs.com/examples/choropleth.html you can do this:

var mapInfo = L.control({position:'topleft'});

info.onAdd = function (map) {
  this._div = L.DomUtil.create('div', 'info'); // create a div with a class "info"
  this.update();
  return this._div;
};

// method that we will use to update the control based on feature properties passed
info.update = function (props) {
    this._div.innerHTML = '<h4>US Population Density</h4>' +  (props ?
    '<b>' + props.name + '</b><br />' + props.density + ' people / mi<sup>2</sup>'
    : 'Hover over a state');
};

info.addTo(map);

The options are set on the control object. So one may think you can do this to position an overlay control:

// incorrect
var layerControl = L.control({position:'topleft'}).layers(null, mapOverlays).addTo(map);

The correct way to do this, as stated above, is:

// correct
var layerControl = L.control.layers(null, mapOverlays, {position:'topleft'}).addTo(map);