Revert "Added doc for the :close adverb in slurp-rest"

This reverts commit 71fde8d.

No spec, no docs. Doc issue #883

doc/Type/IO/Handle.pod6

@@ -277,20 +277,13 @@ Return the current position of the file pointer in bytes.
 
 =head2 method slurp-rest
 
-    multi method slurp-rest(IO::Handle:D: :$bin!, :$close --> Buf)
-    multi method slurp-rest(IO::Handle:D: :$enc, :$close --> Str)
+    multi method slurp-rest(IO::Handle:D: :$bin! --> Buf)
+    multi method slurp-rest(IO::Handle:D: :$enc --> Str)
 
-Returns the remaining content of the file from the current file position
+Return the remaining content of the file from the current file position
 (which may have been set by previous reads or by C<seek>.)  If the
 adverb C<:bin> is provided a L<Buf> will be returned,
-otherwise the return value will be a C<Str> with the optional encoding C<:enc>.
-Specifying the adverb C<:close> will cause the filehandle to be closed when
-the call has finished.
-
-=for code :skip-test
-my $fh = open("content.txt");
-my $line = $fh.get;
-my $rest-of-file = $fh.slurp-rest(:close);
+otherwise the return will be a C<Str> with the optional encoding C<:enc>.
 
 =head2 method Supply