Improve comment

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>

Author: hugovk

Lib/importlib/metadata/__init__.py

@@ -890,7 +890,8 @@ def search(self, prepared: Prepared):
         return itertools.chain(infos, eggs)
 
 
-# Translation table for Prepared.normalize: lowercase and replace - . with _
+# Translation table for Prepared.normalize: lowercase and 
+# replace "-" (hyphen) and "." (dot) with "_" (underscore).
 _normalize_table = str.maketrans(
     "ABCDEFGHIJKLMNOPQRSTUVWXYZ-.",
     "abcdefghijklmnopqrstuvwxyz__",