[clang-tools-extra] [clang-tidy] [docs] Replace _not_ in reserved-identifier.rst with *not* (PR #112162)

[Nick Riasanovsky via cfe-commits]

njriasan wrote:

> @njriasan Thanks for the contribution! I see the commit message would include this:
> 
> ```
> Co-authored-by: Nicholas Riasanovsky <nicholasriasanovsky at macbook-pro.myfiosgateway.com>
> ```
> 
> Do you want to keep that?

@carlosgalvezp That message is because I got a new computer and it wasn't properly setup yet. I would like to remove it if possible. What is the process for updating a commit message in this repo? Should I just force push a modified message to this branch?

https://github.com/llvm/llvm-project/pull/112162