Apply suggestions from code review

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

Author: sumpygump

Lib/uuid.py

@@ -962,7 +962,7 @@ def main():
                         default="uuid4",
                         help="function to generate the UUID")
     parser.add_argument("-n", "--namespace",
-                        metavar=f"{{any UUID,{','.join(namespaces.keys())}}}",
+                        metavar=f"{{any UUID,{','.join(namespaces)}}}",
                         help="uuid3/uuid5 only: "
                         "a UUID, or a well-known predefined UUID addressed "
                         "by namespace name")

Misc/NEWS.d/next/Library/2026-04-18-17-37-13.gh-issue-148740.sYnFi0.rst

@@ -1,2 +1,2 @@
-Fix usage for :mod:`uuid` command line interface to support a custom namespace be
+Fix usage for :mod:`uuid` command-line interface to support a custom namespace be
 provided for uuid3 and uuid5.