docs: _io and _collections were renamed to have standard "u" prefix.

docs/library/index.rst

@@ -28,15 +28,15 @@ library.
        :maxdepth: 1
 
        cmath.rst
-       _collections.rst
        gc.rst
-       _io.rst
        math.rst
        select.rst
        sys.rst
        ubinascii.rst
+       ucollections.rst
        uhashlib.rst
        uheapq.rst
+       uio.rst
        ujson.rst
        uos.rst
        ure.rst
@@ -51,15 +51,15 @@ library.
        :maxdepth: 1
 
        cmath.rst
-       _collections.rst
        gc.rst
-       _io.rst
        math.rst
        select.rst
        sys.rst
        ubinascii.rst
+       ucollections.rst
        uhashlib.rst
        uheapq.rst
+       uio.rst
        ujson.rst
        uos.rst
        ure.rst
@@ -89,14 +89,14 @@ library.
     .. toctree::
        :maxdepth: 1
 
-       _collections.rst
        gc.rst
-       _io.rst
        math.rst
        sys.rst
        ubinascii.rst
+       ucollections.rst
        uhashlib.rst
        uheapq.rst
+       uio.rst
        ujson.rst
        uos.rst
        ure.rst

docs/library/_collections.rst → docs/library/ucollections.rst

-:mod:`_collections` -- collection and container types
+:mod:`ucollections` -- collection and container types
 =====================================================
 
-.. module:: _collections
+.. module:: ucollections
    :synopsis: collection and container types
 
 This module implements advanced collection and container types to
@@ -20,7 +20,7 @@ Classes
     a string with space-separated field named (but this is less efficient).
     Example of use::
 
-        from _collections import namedtuple
+        from ucollections import namedtuple
 
         MyTuple = namedtuple("MyTuple", ("id", "name"))
         t1 = MyTuple(1, "foo")
@@ -34,7 +34,7 @@ Classes
     added. When ordered dict is iterated over, keys/items are returned in
     the order they were added::
 
-        from _collections import OrderedDict
+        from ucollections import OrderedDict
 
         # To make benefit of ordered keys, OrderedDict should be initialized
         # from sequence of (key, value) pairs.

docs/library/_io.rst → docs/library/uio.rst

-:mod:`_io` -- input/output streams
+:mod:`uio` -- input/output streams
 ==================================
 
-.. module:: _io
+.. module:: uio
    :synopsis: input/output streams
 
 This module contains additional types of stream (file-like) objects