Minor edits of spectralDCM.jl

Hijacking this PR to fix minor printing issue in spectral DCM tutorial. Thank you :)

docs/src/tutorials/spectralDCM.jl

@@ -39,8 +39,6 @@ using ModelingToolkit
 # This needs to be represented by the way we define the edges.
 nr = 3             # number of regions
 g = MetaDiGraph()
-regions = []   # list of neural mass blocks to then connect them to each other with an adjacency matrix
-
 # Now add the different blocks to each region and connect the blocks within each region:
 for i = 1:nr
     region = LinearNeuralMass(;name=Symbol("r$(i)₊lm"))
@@ -113,8 +111,6 @@ fig
 # This procedure is similar to before with the difference that we will define global parameters and use tags such as [tunable=false/true] to define which parameters we will want to estimate.
 # Note that parameters are tunable by default.
 g = MetaDiGraph()
-regions = [];   # list of neural mass blocks to then connect them to each other with an adjacency matrix
-
 # The following parameters are shared accross regions, which is why we define them here. 
 @parameters lnκ=0.0 [tunable=false] lnϵ=0.0 [tunable=false] lnτ=0.0 [tunable=false]   # lnκ: decay parameter for hemodynamics; lnϵ: ratio of intra- to extra-vascular components, lnτ: transit time scale
 @parameters C=1/16 [tunable=false]   # note that C=1/16 is taken from SPM12 and stabilizes the balloon model simulation. See also comment above.