fix a grammar error

Author: imor

docs/index.md

@@ -21,7 +21,7 @@
 dbdev is a package manager for Postgres [trusted lanuguage extensions](https://github.com/aws/pg_tle) (TLEs). It consists of:
 
 - [database.dev](https://database.dev): our first-party package registry to store and distribute TLEs
-- dbdev CLI: a CLI for publishing TLEs to a registries
+- dbdev CLI: a CLI for publishing TLEs to a registry
 - dbdev client: an in-database client for installing TLEs from registries
 
 If you want to publish your own TLE, you will need the dbdev CLI. Follow its [installation instructions](install.md) to get started.