[llvm] [llvm-cov][CoverageView] minor fix/improvement to HTML and text coverage output (PR #80952)

[Alan Phipps via llvm-commits]

evodius96 wrote:

> > if you could backport this to the 18.x branch.
> 
> Yes I'm happy to.
> 
> I don't know the procedures well. To my preliminary understanding: first let's wait for this one to get merged into `main`; then I interact with `@llvmbot` here or somewhere else to do the backport. Is that right?

Yes, I think you can follow the steps outlined here: https://llvm.org/docs/GitHub.html#backporting-fixes-to-the-release-branches

https://github.com/llvm/llvm-project/pull/80952