Re: Some Emacs manual errors.

[Richard M. Stallman]

    This section describes the commands to check the spelling of a single
    word or of a portion of a buffer.  These commands work with the spelling
    checker program Ispell, which is not part of Emacs.  *Note Ispell:
    (ispell)Top.

    -> Attempts to follow the Ispell link results in the message

    Info file ispell does not exist

I guess you need to install that file.

    The Emacs documentation section 20.4 Checking and Correcting Spelling
    contains the following text.

    `M-x flyspell-progmode'
         Enable Flyspell mode for comments and strings only.

It seems to be fixed, but thanks for reporting it.
(Maybe someone else saw your message and fixed it.)

    In the top-level info directory the following entries appear twice.
    They seem to represent every other entry in the list that precedes these
    duplicates.

I suspect that is due to a bug in install-info, but that's just a guess.
To make progress on debugging it, you'd need to investigate the processes
of installation that brought the file to its current state.