fixup! Deprecate Base.convert(IOStream, ::Message)

src/message.jl

@@ -33,22 +33,17 @@ behaviour.
 ```jldoctest
 julia> using ZMQ
 
-julia> m = Message("foo")
-3-element Message:
- 102
- 111
- 111
+julia> m = Message("foo");
 
-julia> m[1]  # Array indexing
-102
+julia> Char(m[1]) # Array indexing
+'f': ASCII/Unicode U+0066 (category Ll: Letter, lowercase)
 
-julia> m[end] = 103 # Array assignment
-103
+julia> m[end] = Int('g'); # Array assignment
 
-julia> unsafe_string(m) # Conversion to string (only do this if you know the message is a string)
+julia> unsafe_string(m)  # Conversion to string (only do this if you know the message is a string)
 "fog"
 
-julia> IOBuffer(m) # Create a zero-copy IOBuffer
+julia> IOBuffer(m)  # Create a zero-copy IOBuffer
 IOBuffer(data=UInt8[...], readable=true, writable=false, seekable=true, append=false, size=3, maxsize=Inf, ptr=1, mark=-1)
 ```
 """