[Chapel Merge] Fixes to the documentation of `AutoMath.round` at

Branch: refs/heads/main
Revision: 63f2fc5
Author: lydia-duncan
Link: Unavailable
Log Message:

Merge pull request #20762 from lydia-duncan/mathDocFixes

Fixes to the documentation of AutoMath.round at Damian's suggestion
[used provided wording, not reviewed]

More accurately represents its behavior.

Double checked a built version of the online docs

Modified Files:
M modules/standard/AutoMath.chpl

Compare: https://github.com/chapel-lang/chapel/compare/afc0e10f5900...63f2fc56cbf9