fix the types in the docstrings

src/analysis/screening.jl

@@ -35,11 +35,11 @@ end
 """
     screen(
         model::MetabolicModel;
-        variants::Array{Vector}, N},
-        analysis::Function,
-        args::Array{Vector{Tuple}, N},
+        variants::Array{V,N}, # defaults to an array of identities
+        analysis,
+        args::Array{A,N}, # defaults to an array of empty argument lists
         workers = [myid()],
-    )::Array where {N}
+    )::Array where {V<:AbstractVector,A,N}
 
 Take an array of model-modifying function vectors in `variants`, and execute
 the function `analysis` on all variants of the `model` specified by `variants`.
@@ -113,11 +113,11 @@ screen(args...; kwargs...) =
 """
     _screen_impl(
         model::MetabolicModel;
-        variants::Array{Vector, N},
-        analysis::Function,
-        args::Array{Tuple, N},
+        variants::Array{V,N},
+        analysis,
+        args::Array{A,N},
         workers = [myid()],
-    )::Array where {N}
+    )::Array where {V<:AbstractVector,A,N}
 
 The actual implementation of [`screen`](@ref).
 """
@@ -215,12 +215,12 @@ end
     screen_optmodel_modifications(
         model::MetabolicModel,
         optimizer;
-        common_modifications::Vector = [],
-        modifications::Array{Vector,N},
-        args::Array{Vector{Tuple},N},
+        common_modifications::VF = [],
+        modifications::Array{V,N}, # defaults to an array with no modifications
+        args::Array{A,N}, # defaults to an array of empty argument lists
         analysis::Function,
         workers = [myid()],
-    ) where N
+    )::Array where {V<:AbstractVector,VF<:AbstractVector,A,N}
 
 Screen multiple modifications of the same optimization model.
 
@@ -257,12 +257,12 @@ screen_optmodel_modifications(args...; kwargs...) = _screen_optmodel_modificatio
     _screen_optmodel_modifications_impl(
         model::MetabolicModel,
         optimizer;
-        common_modifications::Vector = [],
-        modifications::Array{Vector,N},
-        args::Array{Tuple,N},
+        common_modifications::VF = [],
+        modifications::Array{V,N},
+        args::Array{A,N},
         analysis::Function,
         workers = [myid()],
-    ) where N
+    )::Array where {V<:AbstractVector,VF<:AbstractVector,A,N}
 
 The actual implementation of [`screen_optmodel_modifications`](@ref).
 """