Broken references in WebXR Hit Test Module

[dontcallmedom-bot]

While crawling WebXR Hit Test Module, the following links to other specifications were detected as pointing to non-existing anchors, which should be fixed:

• https://www.w3.org/TR/webxr/#feature-policy
• https://www.w3.org/TR/webxr/#xrsession-list-of-enabled-features

_{This issue was detected and reported semi-automatically by Strudy based on data collected in webref.}