docs: fix parameter names left from the nautilus era

[darkdi]

These names date back to nautilus: nemo_mime_activate_file still documents @view and @use_new_window, which became parent_window and flags when the window slot work landed, and nemo_launch_application documents @uris although it takes a list of files and builds the uris itself. I left the block above nemo_launch_application_from_command_array alone, since it names the non-array function and moving it is a judgement call.