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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