gh-101100: Fix Sphinx warnings in library/ast.rst

[hugovk]

Fix 29 Sphinx warnings:

Doc/library/ast.rst:46: WARNING: py:mod reference target not found: _ast Doc/library/ast.rst:131: WARNING: py:class reference target not found: ast.Num Doc/library/ast.rst:131: WARNING: py:class reference target not found: ast.Str Doc/library/ast.rst:131: WARNING: py:class reference target not found: ast.Bytes Doc/library/ast.rst:131: WARNING: py:class reference target not found: ast.NameConstant Doc/library/ast.rst:131: WARNING: py:class reference target not found: ast.Ellipsis Doc/library/ast.rst:138: WARNING: py:class reference target not found: ast.Index Doc/library/ast.rst:138: WARNING: py:class reference target not found: ast.ExtSlice Doc/library/ast.rst:1937: WARNING: py:class reference target not found: Str Doc/library/ast.rst:2288: WARNING: py:attr reference target not found: lineno Doc/library/ast.rst:2288: WARNING: py:attr reference target not found: end_lineno Doc/library/ast.rst:2288: WARNING: py:attr reference target not found: col_offset Doc/library/ast.rst:2288: WARNING: py:attr reference target not found: end_col_offset Doc/library/ast.rst:2300: WARNING: py:attr reference target not found: lineno Doc/library/ast.rst:2300: WARNING: py:attr reference target not found: col_offset Doc/library/ast.rst:2316: WARNING: py:attr reference target not found: lineno Doc/library/ast.rst:2316: WARNING: py:attr reference target not found: col_offset Doc/library/ast.rst:2316: WARNING: py:attr reference target not found: end_lineno Doc/library/ast.rst:2316: WARNING: py:attr reference target not found: end_col_offset Doc/library/ast.rst:2369: WARNING: py:meth reference target not found: visit_Num Doc/library/ast.rst:2369: WARNING: py:meth reference target not found: visit_Str Doc/library/ast.rst:2369: WARNING: py:meth reference target not found: visit_Bytes Doc/library/ast.rst:2369: WARNING: py:meth reference target not found: visit_NameConstant Doc/library/ast.rst:2369: WARNING: py:meth reference target not found: visit_Ellipsis Doc/library/ast.rst:2369: WARNING: py:meth reference target not found: visit_Constant Doc/library/ast.rst:2398: WARNING: py:meth reference target not found: generic_visit Doc/library/ast.rst:2406: WARNING: py:attr reference target not found: lineno Doc/whatsnew/3.8.rst:1673: WARNING: py:meth reference target not found: ast.NodeVisitor.visit_Constant build/NEWS:21687: WARNING: py:meth reference target not found: ast.NodeVisitor.visit_Constant 

These 14 remain:

Doc/library/ast.rst:51: WARNING: py:class reference target not found: ast.stmt Doc/library/ast.rst:51: WARNING: py:class reference target not found: ast.expr Doc/library/ast.rst:51: WARNING: py:class reference target not found: ast.expr Doc/library/ast.rst:67: WARNING: py:attr reference target not found: left Doc/library/ast.rst:67: WARNING: py:class reference target not found: ast.expr Doc/library/ast.rst:82: WARNING: py:class reference target not found: ast.expr Doc/library/ast.rst:82: WARNING: py:class reference target not found: ast.stmt Doc/library/ast.rst:96: WARNING: py:class reference target not found: ast.T Doc/library/ast.rst:98: WARNING: py:attr reference target not found: T._fields Doc/library/ast.rst:2149: WARNING: py:class reference target not found: ast.operator Doc/library/ast.rst:2149: WARNING: py:class reference target not found: ast.unaryop Doc/library/ast.rst:2149: WARNING: py:class reference target not found: ast.cmpop Doc/library/ast.rst:2149: WARNING: py:class reference target not found: ast.boolop Doc/library/ast.rst:2149: WARNING: py:class reference target not found: ast.expr_context 

• Issue: Fix all Sphinx reference warnings in the documentation #101100

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📚 Documentation preview 📚: https://cpython-previews--113289.org.readthedocs.build/library/ast.html

[miss-islington-app]

Thanks @hugovk for the PR 🌮🎉.. I'm working now to backport this PR to: 3.11, 3.12.
🐍🍒⛏🤖

[miss-islington-app]

Sorry, @hugovk, I could not cleanly backport this to 3.12 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 76bef3832bae64664882e27ecb6f89800a12cf43 3.12 

[miss-islington-app]

Sorry, @hugovk, I could not cleanly backport this to 3.11 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 76bef3832bae64664882e27ecb6f89800a12cf43 3.11 

[bedevere-app]

GH-113290 is a backport of this pull request to the 3.12 branch.

[bedevere-app]

GH-113291 is a backport of this pull request to the 3.11 branch.