Merge branch 'changelog-facets-all-all-comm' into 'master'

Markus Blattrequested to merge
cherry-pick-985cc2db into releases/2.8

Changelog Added entry about All_All communication on facets.

See merge request !185 (merged)

(cherry picked from commit 985cc2db)

0a228e29 Changelog Added entry about All_All communication on facets.

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