gh-154559: Link the annotations future statement to the language reference

[gchaber]

Closes #154559

The annotations entry in the future-statements table in the __future__ documentation lists PEP 563 and PEP 649, but does not link to the language reference section that documents how annotations actually behave in current Python (https://docs.python.org/3/reference/compound_stmts.html#annotations).

This adds a :ref:annotations`` cross-reference to that table row, as suggested by @picnixz in the issue discussion.

Documentation-only change, so no NEWS entry is included (the skip news label applies). Verified with a full docs build (make -C Doc html, which runs Sphinx with --fail-on-warning): build completes with zero warnings and the rendered page links to reference/compound_stmts.html#annotations.

make patchcheck is clean.

• Issue: Docs: problem with page "__future__ — Future statement definitions" #154559

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Documentation build overview

📚 cpython-previews | 🛠️ Build #33743995 | 📁 Comparing 41f261a against main (a400767)

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1 file changed

± library/__future__.html