[Chapel Merge] Simplify comments on `chpl_llvm.llvm_versions()`

Branch: refs/heads/main
Revision: 251e13f394da4e53062d322249e827ecb8f0d689
Author: arifthpe
Link: Simplify comments on `chpl_llvm.llvm_versions()` by arifthpe · Pull Request #28553 · chapel-lang/chapel · GitHub
Log Message:
Simplify comments on chpl_llvm.llvm_versions() (#28553)

No need to specify that LLVM releases are now a single number, as it's
been that way for a long time.

[trivial, not reviewed]

Compare: Comparing ce2a509508ee3f024b413508f6d5dabe6dc37604...d3b253058acd15af7bd6e2c5fa9804f1f7f9bd49 · chapel-lang/chapel · GitHub

Diff:
M util/chplenv/chpl_llvm.py
https://github.com/chapel-lang/chapel/pull/28553.diff