update byte interpreter link in rpython docs

Merged Bitbucket Importer requested to merge bitbucket/merged-pr-408 into branch/default

Created originally on Bitbucket by loganchien (Logan Chien)

Was already merged in Bitbucket before import, marked as merged by the import user

RPython documents have been spun off from the PyPy document. However, there is still a link to interpreter.rst in translate.rst. This commit fixes the 404 page not found by replacing the link with full PyPy ReadTheDocs URL.

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