Issue #12160: Fix incorrect StreamCodec references in Codec.encode() and Codec.decode() docs.

It should StreamWriter for Codecs.encode() and StreamReader for Codec.decode().

Patch by Nick Weinhold.

Doc/library/codecs.rst

@@ -436,8 +436,8 @@ function interfaces of the stateless encoder and decoder:
    It defaults to ``'strict'`` handling.
 
    The method may not store state in the :class:`Codec` instance. Use
-   :class:`StreamCodec` for codecs which have to keep state in order to make
-   encoding/decoding efficient.
+   :class:`StreamWriter` for codecs which have to keep state in order to make
+   encoding efficient.
 
    The encoder must be able to handle zero length input and return an empty object
    of the output object type in this situation.
@@ -458,8 +458,8 @@ function interfaces of the stateless encoder and decoder:
    It defaults to ``'strict'`` handling.
 
    The method may not store state in the :class:`Codec` instance. Use
-   :class:`StreamCodec` for codecs which have to keep state in order to make
-   encoding/decoding efficient.
+   :class:`StreamReader` for codecs which have to keep state in order to make
+   decoding efficient.
 
    The decoder must be able to handle zero length input and return an empty object
    of the output object type in this situation.

Lib/codecs.py

@@ -141,8 +141,8 @@ class Codec:
             'strict' handling.
 
             The method may not store state in the Codec instance. Use
-            StreamCodec for codecs which have to keep state in order to
-            make encoding/decoding efficient.
+            StreamWriter for codecs which have to keep state in order to
+            make encoding efficient.
 
             The encoder must be able to handle zero length input and
             return an empty object of the output object type in this
@@ -164,8 +164,8 @@ class Codec:
             'strict' handling.
 
             The method may not store state in the Codec instance. Use
-            StreamCodec for codecs which have to keep state in order to
-            make encoding/decoding efficient.
+            StreamReader for codecs which have to keep state in order to
+            make decoding efficient.
 
             The decoder must be able to handle zero length input and
             return an empty object of the output object type in this