Remove misleading documentation about UTF8 flag

Encode.pm

@@ -949,38 +949,11 @@ different kinds of strings and string-operations in Perl: one a
 byte-oriented mode  for when the internal UTF8 flag is off, and the other a
 character-oriented mode for when the internal UTF8 flag is on.
 
-Here is how C<Encode> handles the UTF8 flag.
-
-=over 2
-
-=item *
-
-When you I<encode>, the resulting UTF8 flag is always B<off>.
-
-=item *
-
-When you I<decode>, the resulting UTF8 flag is B<on>--I<unless> you can
-unambiguously represent data.  Here is what we mean by "unambiguously".
-After C<$str = decode("foo", $octet)>,
-
-  When $octet is...    The UTF8 flag in $str is
-  ---------------------------------------------
-  In ASCII only (or EBCDIC only)            OFF
-  In ISO-8859-1                              ON
-  In any other Encoding                      ON
-  ---------------------------------------------
-
-As you see, there is one exception: in ASCII.  That way you can assume
-Goal #1.  And with C<Encode>, Goal #2 is assumed but you still have to be
-careful in the cases mentioned in the B<CAVEAT> paragraphs above.
-
 This UTF8 flag is not visible in Perl scripts, exactly for the same reason
 you cannot (or rather, you I<don't have to>) see whether a scalar contains
 a string, an integer, or a floating-point number.   But you can still peek
 and poke these if you will.  See the next section.
 
-=back
-
 =head2 Messing with Perl's Internals
 
 The following API uses parts of Perl's internals in the current