Move pages under tldr, lint run.sh, update docs

tldr/doctl-databases-replica

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# doctl databases replica
+
+> Manage read-only replicas associated with a database cluster.
+> More information: <https://docs.digitalocean.com/reference/doctl/reference/databases/replica/>.
+
+- Run a `doctl databases replica` command with an access token:
+
+`doctl databases pool {{command}} --access-token {{access_token}}`
+
+- Retrieve information about a read-only database replica:
+
+`doctl databases replica get {{database_id}} {{replica_name}}`
+
+- Retrieve list of read-only database replicas:
+
+`doctl databases replica list {{database_id}}`
+
+- Create a read-only database replica:
+
+`doctl databases replica create {{database_id}} {{replica_name}}`
+
+- Delete a read-only database replica:
+
+`doctl databases replica delete {{database_id}} {{replica_name}}`