Polish the whatsnew entry a bit

gaogaotiantian · gaogaotiantian · commit 93e5f5803eb7 · 2025-05-12T16:59:33.000-04:00
diff --git a/Doc/whatsnew/3.15.rst b/Doc/whatsnew/3.15.rst
@@ -92,7 +92,8 @@ Improved modules
 pdb
 ---
 
-* :pdbcommand:`attach` command has been added to attach to a running process.
+* :pdbcommand:`attach` command is added to attach to a running process
+  from :mod:`pdb`.
   (Contributed by Tian Gao in :gh:`133954`.)
 
 ssl
