Reorganize `os.path` documentation

The os.path documentation is alphabetically sorted. That's great because it's easy to find a function. However, this also means that functions shouldn't reference other functions documented later as the reader may not have been aware of them before.

An alternative is to reorganize the documentation page so that we put at the top the most used functions such as os.path.join. The latter caused a bit of confusion in gh-130527, where neither the OP nor me remembered that os.path.join("/a", "/b") == "/b".

If reorganizing the documentation is not preferred, we should at least add .. seealso:: directives and clickable links so that any function mentioned but not yet documented at the time of reading can be easily looked up.

• os.path.abspath contains a reference to os.path.join without a link.
• os.path.isabs could backlink to os.path.abspath.
• os.path.split mentions os.path.join but as it's far away, we could backlink it.
• os.path.join mentions "If a segment is an absolute path (which on Windows requires both a drive and a root), then all previous segments are ignored and joining continues from the absolute path segment.". We should add an example as it would be more explicit and teaching (e.g., os.path.join("/home/foo", "/home/bar") == "/home/bar".

Linked PRs

• gh-130557
• gh-131872
• gh-132408
• gh-142800
• gh-142801

os.path のドキュメントページから始め、issue に記載されている abspath、isabs、split、join の各項目を確認してください。始める前にリンクされている PR を確認し、そのうえで、採用された方向性が再編成なのか、seealso リンクと例の追加なのかを判断してください。選択した参照先が追いやすく、絶対パスに対する join の動作が明示的に説明されていれば完了です。