fix: more tests and address comments

Signed-off-by: yihong0618 <zouzou0208@gmail.com>

Author: yihong0618

Lib/test/test_pyrepl/test_utils.py

@@ -67,6 +67,7 @@ def test_gen_colors_keyword_highlighting(self):
             ("a.set", [(".", "op")]),
             ("obj.list", [(".", "op")]),
             ("obj.match", [(".", "op")]),
+            ("b. \\\n format", [(".", "op")]),
             # highlights
             ("set", [("set", "builtin")]),
             ("list", [("list", "builtin")]),

Misc/NEWS.d/next/Core_and_Builtins/2025-09-01-16-09-02.gh-issue-138318.t-WEN5.rst

@@ -1,3 +1,4 @@
 The default REPL now avoids highlighting built-in names (for instance :class:`set`
-    or :func:`format`) when they are used as attribute names (for instance in ``value.set``
-    or ``text.format``).
+or :func:`format`) when they are used as attribute names (for instance in ``value.set``
+or ``text.format``).
+