YamlIO custom scalar example fix

[Vedant Kumar via llvm-commits]

Lgtm. Do you need someone to commit this for you?

vedant

> On Jan 29, 2016, at 4:04 AM, Mario Lang via llvm-commits <llvm-commits at lists.llvm.org> wrote:
> 
> Hi.
> 
> The YAML IO "Custom scalar" sample code looks wrong.
> It makes use of "T", while "T" is nowhere defined.
> 
> diff --git a/docs/YamlIO.rst b/docs/YamlIO.rst
> index f0baeb4..7614679 100644
> --- a/docs/YamlIO.rst
> +++ b/docs/YamlIO.rst
> @@ -456,10 +456,10 @@ looks like:
> 
>     template <>
>     struct ScalarTraits<MyCustomType> {
> -      static void output(const T &value, void*, llvm::raw_ostream &out) {
> +      static void output(const MyCustomType &value, void*, llvm::raw_ostream &out) {
>         out << value;  // do custom formatting here
>       }
> -      static StringRef input(StringRef scalar, void*, T &value) {
> +      static StringRef input(StringRef scalar, void*, MyCustomType &value) {
>         // do custom parsing here.  Return the empty string on success,
>         // or an error message on failure.
>         return StringRef();
> 
> -- 
> CYa,
>  ⡍⠁⠗⠊⠕
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