doctl-databases-*: add page (#10882)

* doctl-databases-*: add page

---------

Co-authored-by: Reinhart Previano Koentjoro <reinhart_previano@yahoo.com>
Co-authored-by: Juri Dispan <juri.dispan@posteo.net>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/common/doctl-databases-pool.md

@@ -0,0 +1,24 @@
+# doctl databases pool
+
+> Manage connection pools for your database cluster.
+> More information: <https://docs.digitalocean.com/reference/doctl/reference/databases/pool/>.
+
+- Run a `doctl databases pool` command with an access token:
+
+`doctl databases pool {{command}} --access-token {{access_token}}`
+
+- Retrieve information about a database connection pool:
+
+`doctl databases pool get {{database_id}} {{pool_name}}`
+
+- List connection pools for a database cluster:
+
+`doctl databases pool list {{database_id}}`
+
+- Create a connection pool for a database:
+
+`doctl databases pool create {{database_id}} {{pool_name}} --db {{new_pool_name}} --size {{pool_size}}`
+
+- Delete a connection pool for a database:
+
+`doctl databases pool create {{database_id}} {{pool_name}}`