AssetServer load docs should state that assets don't get loaded multiple times

[torsteingrindvik]

How can Bevy's documentation be improved?

http://dev-docs.bevyengine.org/bevy/asset/struct.AssetServer.html#method.load

When doing a pattern such as in many_foxes.rs:

    let animation_clips = [
        asset_server.load(GltfAssetLabel::Animation(2).from_asset("models/animated/Fox.glb")),
        asset_server.load(GltfAssetLabel::Animation(1).from_asset("models/animated/Fox.glb")),
        asset_server.load(GltfAssetLabel::Animation(0).from_asset("models/animated/Fox.glb")),
    ];

I feel quite sure that reading the fox file from disk happens once and not three times.
To be very sure I checked docs, but they don't explicitly state this behavior.

So I'd like docs to clear up:

• When calling load on the same path several times, how many times is the asset loaded from disk
• When calling load on the same path several times with different labels (#this-type-of-label), will this still only load once from disk