[Chapel Merge] Make debugging Mac caveat more obvious

Branch: refs/heads/main
Revision: 790677e14c1f557efcc716cd3cf1a89348535c1e
Author: jabraham17
Link: Make debugging Mac caveat more obvious by jabraham17 · Pull Request #25627 · chapel-lang/chapel · GitHub
Log Message:
Make debugging Mac caveat more obvious (#25627)

Makes the caveat about CHPL_TARGET_COMPILER for Macs more obvious

[Rveiewed by @DanilaFe]

Compare: Comparing 10cce9a22ba41eb4c5b46df9b4beead373c7c579...fd58a6521de7ae7469799747b877566426c081e8 · chapel-lang/chapel · GitHub

Diff:
M doc/rst/usingchapel/debugging.rst
https://github.com/chapel-lang/chapel/pull/25627.diff