[NET]: Remove junk from packet_mmap.txt

Documentation/networking/packet_mmap.txt

-
-DaveM:
-
-If you agree with it I will send two small patches to modify
-kernel's configure help. 
-
-	Ulisses
-
 --------------------------------------------------------------------------------
 + ABSTRACT
 --------------------------------------------------------------------------------
@@ -405,8 +397,3 @@ then poll for frames.
    
    Jesse Brandeburg, for fixing my grammathical/spelling errors
 
->>> EOF
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