Update conversions_views.md (#170)

Added one more example for understanding better how rawview() of an array is just a reference to same object in a different representation.

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

Author: krishna-vasudev

docs/src/tutorials/conversions_views.md

@@ -229,6 +229,31 @@ julia> a
  1.0N0f8
 ```
 
+We can understand clearly from below code that `v` is an immutable object, or is just 
+a reference of `a`. It doesn't has a separate memory allocated to it:
+
+```jldoctest; setup = :(using Images)
+julia> a = [0.2N0f8,0.8N0f8]
+2-element Array{N0f8,1} with eltype Normed{UInt8,8}:
+ 0.2N0f8
+ 0.8N0f8
+
+julia> v = rawview(a)
+2-element reinterpret(UInt8, ::Array{N0f8,1}):
+ 0x33
+ 0xcc
+
+julia> pointer_from_objref(a) #function used to find address of an object
+Ptr{Nothing} @0x00000000144adc90
+
+julia> pointer_from_objref(v) #v is just a immutable reference to a, no separate memory allocated to it.
+ERROR: pointer_from_objref cannot be used on immutable objects
+Stacktrace:
+ [1] error(::String) at .\error.jl:33
+ [2] pointer_from_objref(::Any) at .\pointer.jl:146
+ [3] top-level scope at none:1
+ ```
+
 The opposite transformation is `normedview`:
 
 ```jldoctest; setup = :(using Images)