[web] vale Various fixes.

Documentation/.vale/Vocab/ogs/accept.txt

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web/content/docs/devguide/documentation/todo/index.md

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...onfiguration_for_MPI_PETSc/configure_for_mpi_and_petsc.md

web/content/docs/devguide/packages/python-env/index.md

web/content/docs/devguide/testing/gitlab-ci/index.md

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web/content/docs/userguide/basics/project_file_intro.md

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web/content/docs/userguide/blocks/linear_solvers.md

web/content/docs/userguide/blocks/processes.md

web/content/docs/userguide/features/python_bc.md

web/content/docs/userguide/troubleshooting/general/index.md