"Roadmap to the manual" chapter in the manual has out of order chapters and missing chapters.

[Roland McGrath]

If you follow all the history back to the original writing of the manual, I
suspect you'll find that it was entirely correct to begin with.  I think
chapters have been added and reordered without regard to the effect on the
introduction.  The manual was originally written by a good writer with
structure that made it a good read for the beginner.  It has accreted a lot
more content and miscellaneous changes since then, with basically no
attention whatsoever to writing quality.