[doc-only] cuda.bindings: clarify getLocalRuntimeVersion docstring

[matysanchez]

Closes #1062

What

Rewrites the docstring for getLocalRuntimeVersion() in cuda_bindings/cuda/bindings/runtime.pyx.in to clearly differentiate it from cudaRuntimeGetVersion():

• getLocalRuntimeVersion() locates the CUDA Runtime shared library on the host via cuda.pathfinder.load_nvidia_dynamic_lib and calls cudaRuntimeGetVersion from that dynamically loaded library. The result reflects the locally discovered cudart version.
• cudaRuntimeGetVersion() returns the version cuda.bindings was built against — a compile-time constant.

Also drops a stray "compile-time constant" sentence from the getLocalRuntimeVersion docstring that actually describes cudaRuntimeGetVersion (originally copy-pasted between the two), and adds cudaRuntimeGetVersion to the See Also section so readers can compare directly.

Why

Per #1062, the two functions' docstrings were nearly identical and didn't explain the distinction, leaving users without a way to choose between them.

Tested

• Read both functions' implementations in the source to derive the actual semantic difference (getLocalRuntimeVersion calls into pathfinder; cudaRuntimeGetVersion reflects the build-time constant).
• No code path changed — only the docstring on the public getLocalRuntimeVersion shim.
• Sphinx markup (:py:obj:) preserved; section structure (Returns / Notes / See Also) unchanged.

Verification

branch: hunter/issue-1062
files-changed: 1
commit: e3ebf05

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