Changelog.

diff --git a/doc/news/changes/minor/20221213StefanoZampini b/doc/news/changes/minor/20221213StefanoZampini
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+Fixed: PETSc has no concept of ownership, but only shared ownership. Vec and Mat objects are
+reference counted, and automatically cleaned when no longer used. We do not need to keep track 
+of ownership manually.
+<br>
+(Stefano Zampini, 2022/12/13)