add BC `getTermDocument` and a note about deprecation
add BC `getTermDocument` and a note about deprecation

zeit/hyperterm,zeit/hyper,zeit/hyper,zeit/hyperterm,zeit/hyper,zeit/hyper,derrickpelletier/hyper,derrickpelletier/hyper,KunalKene1797/hyper,KunalKene1797/hyper