[Chapel Merge] Improve co-locale documentation

Branch: refs/heads/main
Revision: c1585d2b81da665f34a34b47ec1bc5b9c07ed06d
Author: jhh67
Link: Improve co-locale documentation by jhh67 · Pull Request #23964 · chapel-lang/chapel · GitHub
Log Message:
Improve co-locale documentation (#23964)

Add slurm-gasnetrun_* and gasnetrun_* launchers, and improve the
wording.

{Reviewed by @stonea, thank you.]

Compare: Comparing 20b40ac093bae4dcb5f667b0ccd765241ae072ab...1fc8b2d17f9c57291f69a6ee6d17c0dc27bf8571 · chapel-lang/chapel · GitHub

Diff:
M doc/rst/usingchapel/multilocale.rst
https://github.com/chapel-lang/chapel/pull/23964.diff