Merge pull request #25446 from JuliaLang/kc/iocontext_examples

add more examples to iocontext

base/show.jl

@@ -73,6 +73,28 @@ The following properties are in common use:
    `--color` command-line flag when `julia` was launched.
 
 # Examples
+
+```jldoctest
+julia> io = IOBuffer();
+
+julia> print_with_color(:red, IOContext(io, :color => true), "string")
+
+julia> String(take!(io))
+"\e[31mstring\e[39m"
+
+julia> print_with_color(:red, io, "string")
+
+julia> String(take!(io))
+"string"
+```
+
+```jldoctest
+julia> print(IOContext(STDOUT, :compact => false), 1.12341234)
+1.12341234
+julia> print(IOContext(STDOUT, :compact => true), 1.12341234)
+1.12341
+```
+
 ```jldoctest
 julia> function f(io::IO)
            if get(io, :short, false)