Standardize codeblock fences (bash)

doc/administration/auth/ldap-ee.md

doc/administration/auth/ldap.md

doc/administration/file_hooks.md

doc/administration/geo/disaster_recovery/index.md

doc/administration/geo/replication/external_database.md

doc/administration/geo/replication/remove_geo_node.md

doc/administration/geo/replication/using_a_geo_server.md

...dministration/geo/replication/version_specific_updates.md

doc/administration/git_annex.md

doc/administration/gitaly/index.md

doc/administration/high_availability/nfs.md

doc/administration/high_availability/redis.md

doc/administration/invalidate_markdown_cache.md

doc/administration/job_artifacts.md

doc/administration/lfs/lfs_administration.md

doc/administration/lfs/manage_large_binaries_with_git_lfs.md

doc/administration/lfs/migrate_from_git_annex_to_git_lfs.md

...nistration/monitoring/performance/gitlab_configuration.md

...stration/monitoring/performance/influxdb_configuration.md

doc/administration/operations/extra_sidekiq_processes.md