[Chapel Merge] Fix cross-reference to new module

Branch: refs/heads/main
Revision: 8e5c02a
Author: bradcray
Link: Unavailable
Log Message:

Merge pull request #19452 from bradcray/fix-cross-reference

Fix cross-reference to new module

[trivial, not reviewed]

Apparently in adopting the "this module is deprecated" text from the
Spawn module to make sure I adhered to the prescribed wording, I
didn't even take the time to update the name of the module that
replaces ChapelEnv — embarrassing! Thanks Andrew, for catching this.
Even more embarrassing... This is not the first time I've done this
this calendar year.

Modified Files:
M modules/standard/ChapelEnv.chpl

Compare: https://github.com/chapel-lang/chapel/compare/1f9780c042e3...8e5c02ab4334