[Chapel Merge] Update docs related to build changes

Branch: refs/heads/main
Revision: 57e73f1
Author: mppf
Link: Update docs related to build changes by mppf · Pull Request #20613 · chapel-lang/chapel · GitHub
Log Message:

Merge pull request #20613 from mppf/docs-updates-building

Update docs related to build changes

This PR includes docs updates related to PRs #19565 and #20396. This PR
documents:

  • changes to how quickstart works
  • CHPL_LLVM_SUPPORT and the llvm support library being required.

While there, I:

  • adjusted prereqs.rst to only list the supported LLVM versions once and
    to say it is "LLVM and clang" that is needed
  • added sections in chplenv.rst for CHPL_LLVM_SUPPORT, CHPL_LLVM_CONFIG,
    and CHPL_LLVM_GCC_PREFIX

Reviewed by @lydia-duncan - thanks!

Modified Files:
M doc/rst/usingchapel/QUICKSTART.rst

M doc/rst/usingchapel/chplenv.rst
M doc/rst/usingchapel/prereqs.rst

Compare: https://github.com/chapel-lang/chapel/compare/b033395272d0...57e73f11a9d3