[Chapel Merge] Comment adjustments in readcsv how-to

Branch: refs/heads/main
Revision: d16bc59
Author: e-kayrakli
Log Message:

Merge pull request #18414 from e-kayrakli/readcsv-nofast

Comment adjustments in readcsv how-to

The initial test was too slow without --fast, but that issue has been fixed with
Control numCodepoints caching with a config param by e-kayrakli · Pull Request #18403 · chapel-lang/chapel · GitHub. This PR removes that from
the header comment.

Also addresses Readcsv how to by mstrout · Pull Request #18349 · chapel-lang/chapel · GitHub

[Trivial comment changes in test file]

Modified Files:
M test/release/examples/patterns/readcsv.chpl

Compare: https://github.com/chapel-lang/chapel/compare/f9b663de25f0...d16bc59156ac