docs: fix inaccuracies in hipcc_deprecation.md

[david-salinas]

Motivation

Clean up the HIPPC to amdclang++ migration guide.

Technical Details

• Correct amdclang++ description: it is its own binary (amdllvm), not a symlink to clang++
• Fix CMAKE_HIP_COMPILER claim: toolchain sets it to clang++, not amdclang++
• Remove --rtlib=compiler-rt --unwindlib=libgcc references (never landed)
• Expand rocm_agent_enumerator row to include --offload-arch=native for direct invocation path
• Add note that --hip-device-lib-path is usually derivable from --hip-path

Test Plan

Test Result

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/TheRock/blob/main/CONTRIBUTING.md.

[therock-pr-bot]

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[lamb-j]

Need to rebase on the latest TheRock main