Comments on SDL_image + SDL doc project

Hi again all,

I think the “SDL_RWops *src” and “int freesrc” in the SDL_image API should
be explained briefly either in the README or in the header file. I now know
what it means but had to look around for it… I know this is something from
SDL but well, it could save people some time…

Nothing to do with SDL_image but it would be nice to have a "search button"
on the doc project site. (like on SDL main site)

See ya,