chore: fix headers and links and adjust whitespaces

docs/architecture/discovery.md

docs/architecture/distributed_sql.md

docs/architecture/instance_lifecycle.md

docs/architecture/proc_api.md

docs/images/ebnf/create_table.svg

docs/index.md

docs/overview/benefits.md

docs/overview/description.md

docs/overview/feedback.md

docs/overview/glossary.md

docs/reference/ansi_sql.md

docs/reference/api.md

docs/reference/audit_events.md

docs/reference/cli.md

docs/reference/sql_queries.md

docs/reference/sql_types.md

docs/security/integrity.md

docs/tutorial/access_control.md

docs/tutorial/audit_log.md

docs/tutorial/connecting.md