Document Int and Float bounds

[nightcityblade]

Fixes #357

Document inclusive min and max bounds and their unbounded defaults for Int and Float, so generated trait type documentation exposes these accepted keyword arguments.

🤖🤖 This contribution was prepared with OpenAI Codex and reviewed against the rendered documentation and project checks.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.20%. Comparing base (c4f1247) to head (67244a3).

Components	Coverage Δ
traitlets	85.63% <ø> (ø)
tests	99.07% <ø> (ø)

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[nightcityblade]

The sole failing check is the downstream jupyter_server suite: its flaky kernel-restart websocket test failed after 1,154 tests passed (test_restart_kernel, connection count remained 1). This PR only changes Int/Float docstrings; all traitlets tests, lint, docs, packaging, and the other four downstream projects are green. I attempted to rerun the failed job, but GitHub requires repository admin permission. Could a maintainer please rerun it?