Changed user/admin to admin path

doc/administration/geo/replication/configuration.md

doc/administration/geo/replication/multiple_servers.md

doc/administration/geo/setup/database.md

doc/administration/geo/setup/external_database.md

doc/administration/monitoring/ip_allowlist.md

doc/administration/reference_architectures/10k_users.md

doc/administration/reference_architectures/25k_users.md

doc/administration/reference_architectures/2k_users.md

doc/administration/reference_architectures/3k_users.md

doc/administration/reference_architectures/50k_users.md

doc/administration/reference_architectures/5k_users.md

doc/administration/settings/help_page.md

doc/administration/settings/index.md

doc/administration/settings/usage_statistics.md