docs: add seeds documentation to the CLI config reference

GITHUB_PR_NUMBER: 6323
GITHUB_PR_URL: https://github.com/hasura/graphql-engine/pull/6323

Co-authored-by: Todd Heslin <1883112+toddheslin@users.noreply.github.com>
GitOrigin-RevId: e47d0c62b06e4f4782378318fcfa368406f20096

docs/graphql/core/hasura-cli/config-reference.rst

@@ -40,7 +40,8 @@ The configuration file can be configured with the following config keys:
     pg_dump: 
     version: 
   metadata_directory:
-  migrations_directory: 
+  migrations_directory:
+  seeds_directory:
   actions:
     kind: 
     handler_webhook_baseurl: 
@@ -112,6 +113,10 @@ The configuration file can be configured with the following config keys:
      - false
      - 1
      - migrations
+   * - seeds_directory
+     - false
+     - 2
+     - 
    * - actions
      - false
      - 2
@@ -212,6 +217,10 @@ The configuration can also be set in the form of environment variables:
      - ``migrations_directory``
      - Defines the directory where the migration files were stored.
 
+   * - ``HASURA_GRAPHQL_SEEDS_DIRECTORY``
+     - ``seeds_directory``
+     - Defines the directory where the seed files were stored.
+
    * - ``HASURA_GRAPHQL_ACTIONS_KIND``
      - ``actions.kind``
      - Kind to be used for actions.