/usr/share/man/man3/SDL_StretchRow3.3.gz is in libsdl-stretch-dev 0.3.1-10.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/SDL_SetRowStretchCode.3.gz
/usr/share/man/man3/SDL_SetRowStretchCode.3.gz