[PATCH] manual: Update compatibility note flushing of line-oriented files

[Andreas Schwab]

On Jan 29 2025, Florian Weimer wrote:

> Operation systems which represent text files in a line-oriented
> fashion (and not as byte streams with a character sequence reserved
> for line termination) logically cannot flush a buffer without
> also creating a terminated line.
>
> Update this portability note and move it to the Binary Streams
> section.  Add another related compatibility concern, too.

Ok.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
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