Fix typo in library/ipc.rst

Doc/library/ipc.rst

@@ -9,7 +9,7 @@ to communicate.
 
 Some modules only work for two processes that are on the same machine, e.g.
 :mod:`signal` and :mod:`mmap`.  Other modules support networking protocols
-that two or more processes can used to communicate across machines.
+that two or more processes can use to communicate across machines.
 
 The list of modules described in this chapter is: