Update examples.

Author: SebKrantz

src/main/apply_geography.jl

@@ -32,7 +32,7 @@ and similarly for graph traversal costs `delta_tau`.
 
 # Examples
 ```julia
-param, graph = create_graph(init_parameters())
+graph = create_graph(init_parameters())
 geography = (z = 10*(rand(graph[:J]) .> 0.95), obstacles = [1 15; 70 72])
 updated_graph = apply_geography(graph, geography)
 

src/main/create_graph.jl

@@ -25,7 +25,7 @@ Initialize the underlying graph, population and productivity parameters.
 
 # Examples
 ```julia
-graph = create_graph()
+graph = create_graph(init_parameters())
 ```
 """
 function create_graph(param, w = 11, h = 11; type = "map", kwargs...)