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

tldr/doctl-databases-sql-mode

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# doctl databases sql-mode
+
+> View and configure a MySQL database cluster’s global SQL modes.
+> More information: <https://docs.digitalocean.com/reference/doctl/reference/databases/sql-mode/>.
+
+- Run a `doctl databases sql-mode` command with an access token:
+
+`doctl databases sql-mode {{command}} --access-token {{access_token}}`
+
+- Get a MySQL database cluster's SQL modes:
+
+`doctl databases sql-mode get {{database_id}}`
+
+- Overwrite a MySQL database cluster's SQL modes to the specified modes:
+
+`doctl databases sql-mode set {{database_id}} {{sql_mode_1 sql_mode_2 ...}}`