[llvm-branch-commits] [llvm] [BOLT][docs] Expand Heatmaps.md (PR #98162)

[Paschalis Mpeis via llvm-branch-commits]

paschalis-mpeis wrote:

Thanks for your review @aaupov .
This is a stacked pull request as the updated docs refer to the `-print-mappings` option.
So it will be merged after:
- #97567

https://github.com/llvm/llvm-project/pull/98162