Fix a doctest

Author: mhauru

src/pointwise_logdensities.jl

@@ -178,12 +178,12 @@ julia> # A chain with 3 iterations.
 
 julia> pointwise_logdensities(model, chain)
 OrderedDict{VarName, Matrix{Float64}} with 6 entries:
-  "s"     => [-0.802775; -1.38222; -2.09861;;]
-  "m"     => [-8.91894; -7.51551; -7.46824;;]
-  "xs[1]" => [-5.41894; -5.26551; -5.63491;;]
-  "xs[2]" => [-2.91894; -3.51551; -4.13491;;]
-  "xs[3]" => [-1.41894; -2.26551; -2.96824;;]
-  "y"     => [-0.918939; -1.51551; -2.13491;;]
+  s     => [-0.802775; -1.38222; -2.09861;;]
+  m     => [-8.91894; -7.51551; -7.46824;;]
+  xs[1] => [-5.41894; -5.26551; -5.63491;;]
+  xs[2] => [-2.91894; -3.51551; -4.13491;;]
+  xs[3] => [-1.41894; -2.26551; -2.96824;;]
+  y     => [-0.918939; -1.51551; -2.13491;;]
 
 julia> pointwise_logdensities(model, chain, String)
 OrderedDict{String, Matrix{Float64}} with 6 entries: