Fix doctest

Fix doctest seen in:

https://buildkite.com/julialang/julia-master/builds/44616#0194f191-ee57-4a81-ab55-0192700d1df9

Author: ViralBShah

src/cholesky.jl

@@ -65,7 +65,7 @@ julia> C.U
   ⋅    ⋅    3.0
 
 julia> C.L
-3×3 LowerTriangular{Float64, Adjoint{Matrix{Float64}}}:
+3×3 LowerTriangular{Float64, {Matrix{Float64}}:
   2.0   ⋅    ⋅
   6.0  1.0   ⋅
  -8.0  5.0  3.0