[2.2.x] Fixed "byte string" typo in various docs and comments.

Backport of 881362986a from master

docs/ref/files/uploads.txt

@@ -145,7 +145,7 @@ Custom file upload handlers **must** define the following methods:
 
     Receives a "chunk" of data from the file upload.
 
-    ``raw_data`` is a byte string containing the uploaded data.
+    ``raw_data`` is a bytestring containing the uploaded data.
 
     ``start`` is the position in the file where this ``raw_data`` chunk
     begins.

docs/ref/request-response.txt

@@ -38,7 +38,7 @@ All attributes should be considered read-only, unless stated otherwise.
 
 .. attribute:: HttpRequest.body
 
-    The raw HTTP request body as a byte string. This is useful for processing
+    The raw HTTP request body as a bytestring. This is useful for processing
     data in different ways than conventional HTML forms: binary images,
     XML payload etc. For processing conventional form data, use
     :attr:`HttpRequest.POST`.

docs/releases/1.5.txt

@@ -500,7 +500,7 @@ Python's copy of version 2.0.9. However, there are some incompatibilities
 between other versions of ``simplejson``:
 
 - While the ``simplejson`` API is documented as always returning unicode
-  strings, the optional C implementation can return a byte string. This was
+  strings, the optional C implementation can return a bytestring. This was
   fixed in Python 2.7.
 - ``simplejson.JSONEncoder`` gained a ``namedtuple_as_object`` keyword
   argument in version 2.2.
@@ -525,7 +525,7 @@ String types of hasher method parameters
 If you have written a :ref:`custom password hasher <auth_password_storage>`,
 your ``encode()``, ``verify()`` or ``safe_summary()`` methods should accept
 Unicode parameters (``password``, ``salt`` or ``encoded``). If any of the
-hashing methods need byte strings, you can use the
+hashing methods need bytestrings, you can use the
 :func:`~django.utils.encoding.force_bytes` utility to encode the strings.
 
 Validation of previous_page_number and next_page_number

docs/releases/1.7.1.txt

@@ -105,7 +105,7 @@ Bugfixes
   causing ``IntegrityError`` (:ticket:`23611`).
 
 * Made :func:`~django.utils.http.urlsafe_base64_decode` return the proper
-  type (byte string) on Python 3 (:ticket:`23333`).
+  type (bytestring) on Python 3 (:ticket:`23333`).
 
 * :djadmin:`makemigrations` can now serialize timezone-aware values
   (:ticket:`23365`).

docs/releases/1.8.txt

@@ -1111,7 +1111,7 @@ Miscellaneous
   (or 200M, before 1.7.2) to 500M.
 
 * ``reverse()`` and ``reverse_lazy()`` now return Unicode strings instead of
-  byte strings.
+  bytestrings.
 
 * The ``CacheClass`` shim has been removed from all cache backends.
   These aliases were provided for backwards compatibility with Django 1.3.