Update LinRange example to comply with Julia > v1.6 (#41478)

* Update `LinRange` example to comply with Julia > v1.6

* converts example to doctest

Co-authored-by: Johnny Chen <[email protected]>

Co-authored-by: Johnny Chen <[email protected]>

Author: navidcy

base/range.jl

@@ -465,17 +465,17 @@ julia> LinRange(1.5, 5.5, 9)
 
 Compared to using [`range`](@ref), directly constructing a `LinRange` should
 have less overhead but won't try to correct for floating point errors:
-```julia
+```jldoctest
 julia> collect(range(-0.1, 0.3, length=5))
-5-element Array{Float64,1}:
+5-element Vector{Float64}:
  -0.1
   0.0
   0.1
   0.2
   0.3
 
 julia> collect(LinRange(-0.1, 0.3, 5))
-5-element Array{Float64,1}:
+5-element Vector{Float64}:
  -0.1
  -1.3877787807814457e-17
   0.09999999999999999