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 'sajid/dmda_slice_natural' into 'main'

DMDA tutorial example : extract 2D slice from 3D DMDA in natural ordering

See merge request petsc/petsc!3588

new DMDA tutorial example : extract 2D slice from 3D DMDA in natural ordering

new file: src/dm/tutorials/ex22.c
modified: src/dm/tutorials/makefile
new file: src/dm/tutorials/output/ex22_1.

new DMDA tutorial example : extract 2D slice from 3D DMDA in natural ordering

new file: src/dm/tutorials/ex22.c
modified: src/dm/tutorials/makefile
new file: src/dm/tutorials/output/ex22_1.out
new file: src/dm/tutorials/output/ex22_2.out
new file: src/dm/tutorials/output/ex22_3.out
new file: src/dm/tutorials/output/ex22_4.out
new file: src/dm/tutorials/output/ex22_5.out

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