docs(pypi): reformat Types section as stub-style code block (0.2.3) (#149)

The bold-label + comma-list paragraphs render as cramped walls of
inline code on PyPI. A python code block mirroring pdf_inspector.pyi
renders cleanly everywhere and adds field types plus the missing
is_underline/is_strikeout TextItem fields.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

pyproject.toml

@@ -6,7 +6,7 @@ build-backend = "maturin"
 name = "pdf-inspector"
 # Bump this to publish to PyPI — CI publishes automatically when the version
 # changes on main (same flow as napi/package.json for npm).
-version = "0.2.2"
+version = "0.2.3"
 description = "Fast PDF inspection, classification, and text extraction with smart scanned vs text-based detection"
 readme = "docs/python.md"
 license = { text = "MIT" }