[doc patch] fix PRs 48179, 48221 and 48234

[Jonathan Wakely <jwakely dot gcc at gmail dot com>]

This fixes three bugs reported against the docs generated from the 4.6.0 RC.

48179 and 48234 are caused by a @section appearing in a different
order compared to the order they apepar in the @menu, so the order of
sections in the TOC and the Next/Previous navigation links do not
match the section numbering.  This is problem is present on all active
release branches.
48221 simply replaces -Wcpp with -Wno-cpp in the options summary and
removes a stray backslash which prevents the option appearing in the
HTML docs. This is only relevant for 4.6 and trunk.

2011-03-22  Jonathan Wakely  <jwakely.gcc@gmail.com>

        PR other/48179
        PR other/48221
        PR other/48234
        * doc/extend.texi (Alignment): Move section to match order in TOC.
        * doc/invoke.texi (i386 and x86-64 Windows Options): Likewise.
        (Warning Options): Adjust -Wno-cpp summary and remove stray backslash.

Tested on x86_64-linux with "make html"

OK for trunk?
OK for other active branches?
(the -Wno-cpp bit isn't relevant before 4.6 and I will wait for the
4.6 branch to reopen)

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