Clean docstrings and add .JuliaFormatter.jl

Co-Authored-By: Claudio Moroni <43729990+ClaudMor@users.noreply.github.com>
Co-Authored-By: Pietro Monticone <38562595+pitmonticone@users.noreply.github.com>

Author: 3 people

.JuliaFormatter.jl

@@ -0,0 +1,5 @@
+using Pkg                 # Load package manager
+Pkg.add("JuliaFormatter") # Install JuliaFormatter
+
+using JuliaFormatter      # Load JuliaFormatter
+format("."; verbose=true) # Format all files 

.gitignore

@@ -30,4 +30,4 @@ docs/site/
 Manifest.toml
 
 # Formatting files 
-formatter.jl
+##.JuliaFormatter.jl

src/abstractmultilayergraph.jl

@@ -134,7 +134,7 @@ function _specify_interlayer!(
     all(in.([new_interlayer.layer_1, new_interlayer.layer_2], Ref(mg.layers_names))) ||
         throw(
             ErrorException(
-                "The new interlayer conencts two layers that are not (one or both) part of the multilayer graph. Make sure you spelled the `layer_1` and `layer_2` arguments of the `Interlayer` correctly.",
+                "The new interlayer connects two layers that are not (one or both) part of the multilayer graph. Make sure you spelled the `layer_1` and `layer_2` arguments of the `Interlayer` correctly.",
             ),
         )
 
@@ -694,7 +694,7 @@ function Graphs.modularity(
     n_layers = length(mg.layers)
     size(c) == (n_nodes, n_layers) || throw(
         ErrorException(
-            "The size of the community matrx does not match (nn(mg),length(mg.layers)), found $(size(c)) and $((nn(mg),length(mg.layers)))",
+            "The size of the community matrix does not match (nn(mg),length(mg.layers)), found $(size(c)) and $((nn(mg),length(mg.layers)))",
         ),
     )
 

src/traits.jl

@@ -1,5 +1,4 @@
 # Define traits from SimpleTraits.jl
-
 """
     IsWeighted{X}