remove page source links from markdown

docs/architecture/clustering.md

docs/architecture/discovery.md

docs/architecture/distributed_sql.md

docs/architecture/raft_failover.md

docs/architecture/system_tables.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/cli.md

docs/reference/sql_queries.md

docs/reference/sql_types.md

docs/tutorial/connecting.md

docs/tutorial/deploy.md

docs/tutorial/install.md

docs/tutorial/ldap.md

docs/tutorial/monitoring.md

docs/tutorial/sql_examples.md