[Chapel Merge] Adjust the intro paragraph for prereqs.rst

Branch: refs/heads/main
Revision: 7597c86
Author: mppf
Log Message:

Merge pull request #18393 from mppf/prereqs-remove-intro-para

Adjust the intro paragraph for prereqs.rst

It was no longer accurate at least because now we require
C++14 (and other stuff, depending on the configuration, e.g. Python 3.7).

Reviewed by @tzinsky @bradcray @lydia-duncan - thanks!

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

Compare: https://github.com/chapel-lang/chapel/compare/14ab465637ee...7597c8660ada