Address PR feedback: clarify comment, PR title updated to mention Win64

Author: aclark4life

.evergreen/scripts/generate_config.py

@@ -132,7 +132,8 @@ def get_encryption_expansions(encryption):
         display_name = get_variant_name(encryption, host, **expansions)
         tasks = [".test-non-standard"]
         if host != "rhel8":
-            # Exclude PyPy (not supported on non-linux) and coverage tasks (too slow on macOS/win64).
+            # Exclude PyPy (no Evergreen toolchain on macOS/win64) and coverage tasks
+            # (encryption suites exceed the 60-min timeout with coverage overhead on macOS/win64).
             tasks = [".test-non-standard !.pypy !.cov"]
         variant = create_variant(
             tasks,