Document algorithm arguments

[gdalle]

Hey there!
I'm playing more and more with your package, and I find it difficult to understand what every kwarg refers to, eg. here:

FrankWolfe.jl/src/afw.jl

Lines 10 to 35 in 7e8e3c8

	function away_frank_wolfe(
	f,
	grad!,
	lmo,
	x0;
	line_search::LineSearchMethod=Adaptive(),
	L=Inf,
	gamma0=0,
	K=2.0,
	step_lim=20,
	epsilon=1e-7,
	away_steps=true,
	lazy=false,
	momentum=nothing,
	max_iteration=10000,
	print_iter=1000,
	trajectory=false,
	verbose=false,
	linesearch_tol=1e-7,
	emphasis::Emphasis=memory,
	gradient=nothing,
	renorm_interval=1000,
	callback=nothing,
	timeout=Inf,
	print_callback=print_callback,
	)

Would it be possible to add a brief one-liner for each argument to the documentation?

[matbesancon]

I agree it would be great to have an explanation for each of them. Not sure whether the docstring or the docs directly would be better as a location

[gdalle]

I would put them in the docstring so that they can be displayed in the REPL