You may be looking for a digital scan of the original printed instruction booklet (the "paper" manual) that came inside the Wii game case.
There are fan-made "Paper Mario" style mods for the Wii game that replace the 3D models with 2D paper aesthetics. Key Context for this File Super-Mario-Galaxy-Eu-Nintendo-Wii.zip
The inclusion of the word in your search suggests you are looking for one of two things related to this specific file or game: You may be looking for a digital scan