[xargs] Update docblock
@@ -106,6 +106,7 @@ def _thread_mapper(maxsize):
def xargs(cmd, varargs, **kwargs):
"""A simplified implementation of xargs.
+ color: Make a pty if on a platform that supports it
negate: Make nonzero successful and zero a failure
target_concurrency: Target number of partitions to run concurrently
"""
