Changed a few spelling mistakes.

doc.zih.tu-dresden.de/docs/data_lifecycle/file_systems.md

doc.zih.tu-dresden.de/docs/data_lifecycle/overview.md

doc.zih.tu-dresden.de/docs/jobs_and_resources/overview.md

doc.zih.tu-dresden.de/docs/jobs_and_resources/rome_nodes.md

doc.zih.tu-dresden.de/docs/jobs_and_resources/slurm.md

doc.zih.tu-dresden.de/docs/software/data_analytics_with_r.md

....tu-dresden.de/docs/software/mpi_usage_error_detection.md