[Chapel Merge] Trivial heap doc fixes

Branch: refs/heads/master
Revision: 0c84e7d
Author: e-kayrakli
Log Message:

Merge pull request #16543 from e-kayrakli/heap-doc-fix

Trivial heap doc fixes

Fixes a typo and adds a link to Comparators in the new Heap module’s docs.

make docs runs successfully.

[Reviewed by @dlongnecke-cray]

Modified Files:
M modules/standard/Heap.chpl

Compare: https://github.com/chapel-lang/chapel/compare/1b16692bdbd7...0c84e7d874a6