Docs: Changed tips to notes

doc/administration/auth/ldap/google_secure_ldap.md

...disaster_recovery/runbooks/planned_failover_multi_node.md

...isaster_recovery/runbooks/planned_failover_single_node.md

doc/administration/geo/replication/troubleshooting.md

doc/administration/incoming_email.md

doc/administration/issue_closing_pattern.md

doc/administration/packages/container_registry.md

doc/administration/reference_architectures/10k_users.md

doc/administration/reference_architectures/25k_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/troubleshooting/postgresql.md

doc/api/branches.md

doc/ci/README.md

doc/ci/caching/index.md

doc/ci/docker/using_docker_build.md

doc/ci/introduction/index.md

doc/ci/pipelines/index.md

doc/ci/ssh_keys/README.md