Removed duplicate timeout parameter in ClientSession reference docs. (#5262) (#5265)

Co-authored-by: Gary Wilson Jr <gary@thegarywilson.com>

Author: aio-libs-github-bot[bot]

CONTRIBUTORS.txt

@@ -109,6 +109,7 @@ Florian Scheffler
 Frederik Gladhorn
 Frederik Peter Aalund
 Gabriel Tremblay
+Gary Wilson Jr.
 Gennady Andreyev
 Georges Dubus
 Greg Holt

docs/client_reference.rst

@@ -129,7 +129,7 @@ The client session supports the context manager protocol for self closing.
       requests where you need to handle responses with status 400 or
       higher.
 
-   :param timeout: a :class:`ClientTimeout` settings structure, 5min
+   :param timeout: a :class:`ClientTimeout` settings structure, 300 seconds (5min)
         total timeout by default.
 
       .. versionadded:: 3.3
@@ -150,9 +150,6 @@ The client session supports the context manager protocol for self closing.
 
          Use ``timeout`` parameter instead.
 
-   :param timeout: a :class:`ClientTimeout` settings structure, 300 seconds (5min)
-        total timeout by default.
-
    :param bool connector_owner:
 
       Close connector instance on session closing.