Update src/multilayergraph.jl

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Author: simsurace

src/multilayergraph.jl

@@ -7,7 +7,7 @@ mutable struct MultilayerGraph{T,U} <: AbstractMultilayerGraph{T,U}
     layers::Vector{LayerDescriptor{T,U}} # vector containing all the layers of the multilayer graph. Their underlying graphs must be all undirected.
     interlayers::OrderedDict{Set{Symbol},InterlayerDescriptor{T,U}} # the ordered dictionary containing all the interlayers of the multilayer graph. Their underlying graphs must be all undirected.
     v_V_associations::Bijection{T,<:MultilayerVertex} # A Bijection from Bijections.jl that associates numeric vertices to `MultilayerVertex`s.
-    idx_N_associations::Bijection{Int64,Node,Dict{Int64, Node}, Dict{Node, Int64}} # A Bijection from Bijections.jl that associates Int64 to `Node`s.
+    idx_N_associations::Bijection{Int64,Node,Dict{Int64,Node},Dict{Node,Int64}} # A Bijection from Bijections.jl that associates Int64 to `Node`s.
     fadjlist::Vector{Vector{HalfEdge{<:MultilayerVertex,<:Union{Nothing,U}}}} # the forward adjacency list of the MultilayerGraph. It is a vector of vectors of `HalfEdge`s. Its i-th element are the `HalfEdge`s that originate from `v_V_associations[i]`.
     v_metadata_dict::Dict{T,<:Union{<:Tuple,<:NamedTuple}} #  A Dictionary that associates numeric vertices to their metadata.
 end