[docs] Prefer --gcc-install-dir= to deprecated GCC_INSTALL_PREFIX #85458
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Setting GCC_INSTALL_PREFIX leads to a warning (#77537).
Link: https://discourse.llvm.org/t/add-gcc-install-dir-deprecate-gcc-toolchain-and-remove-gcc-install-prefix/65091
Link: https://discourse.llvm.org/t/correct-cmake-parameters-for-building-clang-and-lld-for-riscv/72833