fairly large, most are caused by reformatting section and subsection
headings.  The changes fall into the following categories:

    * reformatted section and subsection headers.

    * escaped isolated asterisks which would be interpreted as starting bold
      or italic text (e.g. "void (*)(PyObject \*)").

    * quoted stuff that looks like internal references but isn't
      (e.g. ``PyCmp_``).

    * changed visually balanced quotes to just use apostrophes
      (e.g. "'string'" instead of "`string'").

    * introduced and indenting multiline chunks of code.

    * created one table (search for "New codecs").