bpo-35506: Remove redundant and incorrect links from keywords. (GH-11174)

diff --git a/Doc/library/pickle.rst b/Doc/library/pickle.rst
index 100a6a1..53eb5d3 100644
--- a/Doc/library/pickle.rst
+++ b/Doc/library/pickle.rst
@@ -931,7 +931,7 @@
 .. [#] Don't confuse this with the :mod:`marshal` module
 
 .. [#] This is why :keyword:`lambda` functions cannot be pickled:  all
-    :keyword:`lambda` functions share the same name:  ``<lambda>``.
+    :keyword:`!lambda` functions share the same name:  ``<lambda>``.
 
 .. [#] The exception raised will likely be an :exc:`ImportError` or an
    :exc:`AttributeError` but it could be something else.