[merge][#32235] document symbol_versioning

[Martin Pool]

On 9/18/07, Aaron Bentley <aaron.bentley at utoronto.ca> wrote:

> Or perhaps it would make sense to add "deprecated_static_method" to
> encapsulate the recipe for good?

Maybe, though we'd need one for both statics and class methods.  It
would give us the chance to give a more precise message.

I think just having it documented is an improvement, so I'll merge
this with Jelmer's suggestion and a test that it works.

-- 
Martin