The master doc is not up to date.
For example
https://aframe.io/docs/master/components/gltf-model.html#scene_properties_dracodecoderpath
still mentions draco 1.5.5 but I updated it to 1.5.6 the 13 February https://github.com/aframevr/aframe/blob/master/docs/components/gltf-model.md