Update docs/source/user/performance-tips.rst
Update docs/source/user/performance-tips.rst

Use RST's note feature for the advisory about relationship between icc_rt and intel-cmplr-lib-rt to stand out.

Co-authored-by: stuartarchibald <bea6903cc29f240e46cd18ca8cb3cffc8245594f@users.noreply.github.com>
numba/numba,cpcloud/numba,numba/numba,cpcloud/numba,numba/numba,cpcloud/numba,numba/numba,numba/numba,cpcloud/numba,cpcloud/numba