Use infinitive, not 3rd person of present tense.

pitrou · pitrou · commit b3593cada2ee · 2011-07-11T01:39:19.000+02:00
diff --git a/Doc/library/ssl.rst b/Doc/library/ssl.rst
@@ -417,7 +417,7 @@ SSL sockets also have the following additional methods and attributes:
 
 .. method:: SSLSocket.do_handshake()
 
-   Performs the SSL setup handshake.
+   Perform the SSL setup handshake.
 
 .. method:: SSLSocket.getpeercert(binary_form=False)
 
