Restore `LinearRegression` documentation#5020

Merged

rapids-bot[bot] merged 4 commits intorapidsai:branch-22.12from viclafargue:restore-doc

Nov 29, 2022

+36-434

Commits on Nov 22, 2022

Decorator method
viclafargue
committed

Commits on Nov 23, 2022

fix
viclafargue
committed

Commits on Nov 25, 2022

Explicit decorator
viclafargue
committed

Commits on Nov 28, 2022

removing unecessary check
viclafargue
committed