[Chapel Merge] Refer to `brew --cellar` when talking about the Ho

Branch: refs/heads/main
Revision: 3cd225c
Author: DanilaFe
Link: Unavailable
Log Message:

Merge pull request #20136 from DanilaFe/docs-homebrew-home

Refer to brew --cellar when talking about the Homebrew cellar.

The cellar isn't in the same place on all systems. By using the
brew --cellar command instead of hardcoding a path,
we can be more sure that the instructions and documentation
works on our users' machines.

Modified Files:
M doc/rst/platforms/macosx.rst

Compare: https://github.com/chapel-lang/chapel/compare/7846b1816265...3cd225cb704a