os.exec* and os.spawn* functions describe their arg* parameters differently

# Documentation


The os.exec* functions (https://docs.python.org/3/library/os.html#os.execl) and os.spawn* functions (https://docs.python.org/3/library/os.html#os.spawnl) are very similar.  But the exec functions use `arg0, arg1, ...` where the spawn functions use just `...`.  They should be the same, though I'm not sure which style I like better.
