Mark up constants in socket doc as such

Doc/library/socket.rst

@@ -72,17 +72,17 @@ numeric address in *host* portion.
    tuple, and the fields depend on the address type. The general tuple form is
    ``(addr_type, v1, v2, v3 [, scope])``, where:
 
-   - *addr_type* is one of TIPC_ADDR_NAMESEQ, TIPC_ADDR_NAME, or
-     TIPC_ADDR_ID.
-   - *scope* is one of TIPC_ZONE_SCOPE, TIPC_CLUSTER_SCOPE, and
-     TIPC_NODE_SCOPE.
-   - If *addr_type* is TIPC_ADDR_NAME, then *v1* is the server type, *v2* is
+   - *addr_type* is one of :const;`TIPC_ADDR_NAMESEQ`, :const:`TIPC_ADDR_NAME`,
+     or :const:`TIPC_ADDR_ID`.
+   - *scope* is one of :const:`TIPC_ZONE_SCOPE`, :const:`TIPC_CLUSTER_SCOPE`,
+     and :const:`TIPC_NODE_SCOPE`.
+   - If *addr_type* is :const:`TIPC_ADDR_NAME`, then *v1* is the server type, *v2* is
      the port identifier, and *v3* should be 0.
 
-     If *addr_type* is TIPC_ADDR_NAMESEQ, then *v1* is the server type, *v2*
+     If *addr_type* is :const:`TIPC_ADDR_NAMESEQ`, then *v1* is the server type, *v2*
      is the lower port number, and *v3* is the upper port number.
 
-     If *addr_type* is TIPC_ADDR_ID, then *v1* is the node, *v2* is the
+     If *addr_type* is :const:`TIPC_ADDR_ID`, then *v1* is the node, *v2* is the
      reference, and *v3* should be set to 0.