pythongh-117026: Remove outdated sentence in SimpleHTTPRequestHandler docs (pythonGH-117027)

The code was changed in 0f7cddc (bpo-839496/pythongh-39531).

Author: SalehDehqanpour

Doc/library/http.server.rst

@@ -429,8 +429,7 @@ instantiation, of which this module provides three different variants:
       ``'Last-Modified:'`` header with the file's modification time.
 
       Then follows a blank line signifying the end of the headers, and then the
-      contents of the file are output. If the file's MIME type starts with
-      ``text/`` the file is opened in text mode; otherwise binary mode is used.
+      contents of the file are output.
 
       For example usage, see the implementation of the ``test`` function
       in :source:`Lib/http/server.py`.