Corrected docs for dt_imageio_module_format_t.write_image.

Author: koto

tools/lua_doc/content.lua

@@ -668,7 +668,7 @@ darktable.debug.type:set_text([[Similar to the system function type() but it wil
 	types.dt_imageio_module_format_t.write_image:add_parameter("image",types.dt_lua_image_t,[[The image object to export.]])
 	types.dt_imageio_module_format_t.write_image:add_parameter("filename","string",[[The filename to export to.]])
 	types.dt_imageio_module_format_t.write_image:add_parameter("allow_upscale","boolean",[[Set to true to allow upscaling of the image.]]):set_attribute("optional",true)
-	types.dt_imageio_module_format_t.write_image:add_return("boolean",[[Returns true on success.]])
+	types.dt_imageio_module_format_t.write_image:add_return("boolean",[[Returns false on success.]])
 
 	types.dt_imageio_module_format_data_png:set_text([[Type object describing parameters to export to png.]])
 	types.dt_imageio_module_format_data_png.bpp:set_text([[The bpp parameter to use when exporting.]])