bpo-43225: [DOC] Add missing value returned by methods on cookiejar (GH-24522)

* Add missing value returned by methods on cookiejar

Documentation say that return something but don't specific with what
value is return, and that can be confuse. This patch add that information.

* Update Doc/library/http.cookiejar.rst

Co-authored-by: andrei kulakov <[email protected]>

* Update Doc/library/http.cookiejar.rst

Co-authored-by: andrei kulakov <[email protected]>

Co-authored-by: andrei kulakov <[email protected]>

Author: eamanu

Doc/library/http.cookiejar.rst

@@ -494,7 +494,8 @@ and ``".168.1.2"``, 192.168.1.2 is blocked, but 193.168.1.2 is not.
 
 .. method:: DefaultCookiePolicy.is_blocked(domain)
 
-   Return whether *domain* is on the blocklist for setting or receiving cookies.
+   Return ``True`` if *domain* is on the blocklist for setting or receiving
+   cookies.
 
 
 .. method:: DefaultCookiePolicy.allowed_domains()
@@ -509,7 +510,7 @@ and ``".168.1.2"``, 192.168.1.2 is blocked, but 193.168.1.2 is not.
 
 .. method:: DefaultCookiePolicy.is_not_allowed(domain)
 
-   Return whether *domain* is not on the allowlist for setting or receiving
+   Return ``True`` if *domain* is not on the allowlist for setting or receiving
    cookies.
 
 :class:`DefaultCookiePolicy` instances have the following attributes, which are
@@ -766,4 +767,3 @@ returned::
    cj = CookieJar(policy)
    opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))
    r = opener.open("http://example.com/")
-