Minor fix of docs of load_domain

The function load_domain always need to have as input the path to the
domain file. Most of the uses of load_domain have inside the parenthesis
"path to domain data package". To keep consistency, this commit adds
this text to two calls of the functions that did not had an input.

docs/src/usage/scenario_generation.md

@@ -90,7 +90,7 @@ those factors as constants. These then get ignored for the purpose of scenario
 generation.
 
 ```julia
-dom = ADRIA.load_domain()
+dom = ADRIA.load_domain("path to domain data package")
 
 # Could keep a copy of the original model parameters/bounds
 # to reset to later.
@@ -123,7 +123,7 @@ Samples can also be taken over a constrained range. For example, if one wanted t
 scenarios with high fogging and seeding, the following could be used:
 
 ```julia
-dom = ADRIA.load_domain()
+dom = ADRIA.load_domain("path to domain data package")
 
 # Adjust seeding bounds. Note only lower and upper bounds are needed because the factors in
 # question have a uniform distribution.