PEP 3156: Fix incorrect indentation of bullet point (#3733)

This has no effect on HTML rendering but is slightly jarring when reading the PEP source.

Author: ryomahan

peps/pep-3156.rst

@@ -708,10 +708,10 @@ use a different transport and protocol interface.
     Windows.
 
   - ``family``, ``flags``: Address family and flags to be passed
-     through to ``getaddrinfo()``.  The family defaults to
-     ``AF_UNSPEC``; the flags default to ``AI_PASSIVE``.  (The socket
-     type is always ``SOCK_STREAM``; the socket protocol always set to
-     ``0``, to let ``getaddrinfo()`` choose.)
+    through to ``getaddrinfo()``.  The family defaults to
+    ``AF_UNSPEC``; the flags default to ``AI_PASSIVE``.  (The socket
+    type is always ``SOCK_STREAM``; the socket protocol always set to
+    ``0``, to let ``getaddrinfo()`` choose.)
 
   - ``sock``: An optional socket to be used instead of using the
     ``host``, ``port``, ``family`` and ``flags`` arguments.  If this