Explicit comment detailing import to activate extension

Author: ConnectedSystems

docs/src/examples/calibration.md

@@ -16,7 +16,8 @@ using Statistics
 using CSV, DataFrames, YAML
 using Streamfall
 
-using Plots
+# Import visualization packages to compile extensions
+using Plots, GraphPlot
 
 
 sn = load_network("Example Network", "../test/data/campaspe/campaspe_network.yml")

docs/src/examples/network_loading.md

@@ -4,6 +4,7 @@ Loading a pre-defined network from a YAML file.
 
 ```julia
 using YAML
+using Plots, GraphPlot
 using Streamfall