[wwwdocs] gcc-13/changes.html + projects/gomp: OpenMP GCC 13 update

[Tobias Burnus <tobias@codesourcery.com>]

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This patch updates the OpenMP implementation status, based on libgomp.texi.
For the release notes, it also moves 'non-rectangular loop nests' up as that's
a 5.0 not a 5.1 feature.
And in line with libgomp.texi, it adds to projects/gomp/ the items for TR11,
a OpenMP 6.0 preview. (Hence, the id="omp6.0" to have a fixed id even when
the list is updated to TR12 and later OpenMP 6.0.)

Comments? Suggestions? OK?

Tobias

PS: There will be surely more updates before GCC 13 is released; I hope/assume
the next change will be for nvptx reverse offload...
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commit 9f80367e539839fff1df2c85fc2640638199fc9e
Author: Tobias Burnus <tobias@codesourcery.com>
Date:   Tue Dec 6 09:49:30 2022 +0100

    libgomp.texi: Fix a OpenMP 5.2 and a TR11 impl-status item
    
    libgomp/
            * libgomp.texi (OpenMP 5.2): Add missing 'the'.
            (TR11): Add missing '@tab N @tab'.
---
 libgomp/libgomp.texi | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libgomp/libgomp.texi b/libgomp/libgomp.texi
index 4caac497506..efa7d956a33 100644
--- a/libgomp/libgomp.texi
+++ b/libgomp/libgomp.texi
@@ -406,7 +406,7 @@ to address of matching mapped list item per 5.1, Sect. 2.21.7.2 @tab N @tab
 @item @code{allocate} and @code{firstprivate} clauses on @code{scope}
       @tab Y @tab
 @item @code{ompt_callback_work} @tab N @tab
-@item Default map-type for @code{map} clause in @code{target enter/exit data}
+@item Default map-type for the @code{map} clause in @code{target enter/exit data}
       @tab Y @tab
 @item New @code{doacross} clause as alias for @code{depend} with
       @code{source}/@code{sink} modifier @tab Y @tab
@@ -463,6 +463,7 @@ Technical Report (TR) 11 is the first preview for OpenMP 6.0.
 @item @code{access} allocator trait changes @tab N @tab
 @item Extension of @code{interop} operation of @code{append_args}, allowing all
       modifiers of the @code{init} clause
+      @tab N @tab
 @item @code{interop} clause to @code{dispatch} @tab N @tab
 @item @code{apply} code to loop-transforming constructs @tab N @tab
 @item @code{omp_curr_progress_width} identifier @tab N @tab