docs: remove double quotes (") from DB_HOST environment variable (#2514)

Author: nova-api

docs/extending-seerr/database-config.mdx

@@ -30,7 +30,7 @@ If your PostgreSQL server is configured to accept TCP connections, you can speci
 
 ```dotenv
 DB_TYPE=postgres # Which DB engine to use, either sqlite or postgres. The default is sqlite.
-DB_HOST="localhost" # (optional) The host (URL) of the database. The default is "localhost".
+DB_HOST=localhost # (optional) The host (URL) of the database. The default is "localhost".
 DB_PORT="5432" # (optional) The port to connect to. The default is "5432".
 DB_USER= # (required) Username used to connect to the database.
 DB_PASS= # (required) Password of the user used to connect to the database.