Docstring consistency with the updated .tex files.

Lib/email/MIMEImage.py

@@ -21,7 +21,7 @@ class MIMEImage(MIMENonMultipart):
 
         _imagedata is a string containing the raw image data.  If this data
         can be decoded by the standard Python `imghdr' module, then the
-        subtype will be automatically included in the Content-Type: header.
+        subtype will be automatically included in the Content-Type header.
         Otherwise, you can specify the specific image subtype via the _subtype
         parameter.
 
@@ -29,11 +29,11 @@ class MIMEImage(MIMENonMultipart):
         transport of the image data.  It takes one argument, which is this
         Image instance.  It should use get_payload() and set_payload() to
         change the payload to the encoded form.  It should also add any
-        Content-Transfer-Encoding: or other headers to the message as
+        Content-Transfer-Encoding or other headers to the message as
         necessary.  The default encoding is Base64.
 
         Any additional keyword arguments are passed to the base class
-        constructor, which turns them into parameters on the Content-Type:
+        constructor, which turns them into parameters on the Content-Type
         header.
         """
         if _subtype is None: