gh-151950: Fix unresolved AST references in ast.rst

[jx2lee]

This updates AST references in Doc/library/ast.rst that do not have Sphinx documentation targets. Prefixing the roles with ! preserves their semantic formatting while suppressing link generation. The constructor description now refers to AST node classes generally instead of the nonexistent ast.T.

The location-attributes paragraph is unchanged because it overlaps with PR #158039.

Testing:

• make -C Doc html SPHINXOPTS="-n" SOURCES=library/ast.rst still reports the two ast.expr and ast.stmt warnings in the unchanged paragraph.

• Issue: Fix Sphinx reference warnings in various Doc/library/ files #151950

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1 file changed

± library/ast.html