[DOC]: Fix cuda.bindings documentation build warnings #3383

Problem

The cuda-bindings docs build succeeds but is not warning-free. The 13.5.0 release dry run reported 102 Sphinx warnings. Most are inherited from earlier releases, and not all 102 are necessarily distinct bugs.

Examples (not a complete list)

• Failed autosummary imports: .rst catalog entries that name objects which cannot be imported (for example cu_memcpy in driver_v2.rst and several stale names in nvml.rst). Sphinx drops the entry and its detail page without leaving a visibly broken row.
• Malformed reST and duplicate object descriptions reported in the Sphinx output.
• Missing fragment targets on the legacy pages: 44 in total (34 driver, 10 runtime). They are broken back-references from problematic markup, including unescaped pointer asterisks. The same fragments are missing in the published 13.4.4 pages.

Plan of action

1. Baseline: save the complete Sphinx warning list from a clean docs build and group it by category (import failure, reST syntax, duplicate description, other).
2. Autosummary imports: fix or remove each entry that fails to import.
3. Markup: escape the pointer asterisks that produce the missing fragment targets, then fix the malformed reST.
4. Duplicates: resolve duplicate object descriptions, either by removing the redundant directive or by adding :no-index: where both are intentional.
5. Re-verify: rebuild, compare against the baseline, and record the remaining count and any warnings deliberately left.
6. Prevent regressions: once the count is near zero, make the docs build fail on new warnings (for example -W, or a recorded warning budget).