Merge branch 'jolivet/feature-rm-spaces-plurals' into 'main'

Remove unneeded spaces/plurals

See merge request petsc/petsc!5193

Remove extra spaces and unwanted plurals

Merge branch 'barry/2022-01-27/doc-cco-finite-elements' into 'main'

Cook up trivial demo of use of MatSetPreallocationCOO() with finite elements

See merge request petsc/petsc!4773

Cook up trivial demo of use of MatSetPreallocationCOO() with finite elements

Clarify MatSetPreallocationCOO() usage in manual page

Kokkos part of example provided by Jed Brown

Commit-type: docs, e

Cook up trivial demo of use of MatSetPreallocationCOO() with finite elements

Clarify MatSetPreallocationCOO() usage in manual page

Kokkos part of example provided by Jed Brown

Commit-type: docs, example
/spend 3h
Reported-by: Fande Kong <fdkong.jd@gmail.com>
Thanks-to: Jed Brown <jed@jedbrown.org>
Thanks-to: Junchao Zhang <jczhang@mcs.anl.gov>

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