Issue #19676: Tweak documentation a bit.

* Updated version info to 3.5
* Fixed a markup error
* Added a versionadded directive to namereplace_errors documentation

Doc/c-api/codec.rst

@@ -118,6 +118,6 @@ Registry API for Unicode encoding error handlers
 
 .. c:function:: PyObject* PyCodec_NameReplaceErrors(PyObject *exc)
 
-   Replace the unicode encode error with `\N{...}` escapes.
+   Replace the unicode encode error with ``\N{...}`` escapes.
 
-  .. versionadded: 3.4
+   .. versionadded:: 3.5

Doc/library/codecs.rst

@@ -239,6 +239,8 @@ functions which use :func:`lookup` for the codec lookup:
    Implements the ``namereplace`` error handling (for encoding only): the
    unencodable character is replaced by a ``\N{...}`` escape sequence.
 
+   .. versionadded:: 3.5
+
 To simplify working with encoded files or stream, the module also defines these
 utility functions:
 
@@ -394,7 +396,7 @@ schemes:
 .. versionchanged:: 3.4
    The ``'surrogatepass'`` error handlers now works with utf-16\* and utf-32\* codecs.
 
-.. versionadded:: 3.4
+.. versionadded:: 3.5
    The ``'namereplace'`` error handler.
 
 The set of allowed values can be extended via :meth:`register_error`.