[PR #7995/43a5bc50 backport][3.9] Fix examples of fallback_charset_resolver function in client_advanced documentation (#8044)

**This is a backport of PR #7995 as merged into master
(43a5bc5).**

Co-authored-by: OMOTO Tsukasa <[email protected]>

Author: patchback[bot]

CHANGES/7995.doc

@@ -0,0 +1 @@
+Fix examples of `fallback_charset_resolver` function in client_advanced documentation. -- by :user:`henry0312`

docs/client_advanced.rst

@@ -674,12 +674,12 @@ example, this can be used with the ``chardetng_py`` library.::
 
     def charset_resolver(resp: ClientResponse, body: bytes) -> str:
         tld = resp.url.host.rsplit(".", maxsplit=1)[-1]
-        return detect(body, allow_utf8=True, tld=tld)
+        return detect(body, allow_utf8=True, tld=tld.encode())
 
     ClientSession(fallback_charset_resolver=charset_resolver)
 
 Or, if ``chardetng_py`` doesn't work for you, then ``charset-normalizer`` is another option::
 
     from charset_normalizer import detect
 
-    ClientSession(fallback_charset_resolver=lamba r, b: detect(b)["encoding"] or "utf-8")
+    ClientSession(fallback_charset_resolver=lambda r, b: detect(b)["encoding"] or "utf-8")