Merge pull request #3349 from ClickHouse/descriptions_on_autogenerated

Update autogenerate-settings.sh with descriptions

Author: gingerwizard

scripts/settings/autogenerate-settings.sh

@@ -70,6 +70,7 @@ title: Format Settings
 sidebar_label: Format Settings
 slug: /operations/settings/formats
 toc_max_heading_level: 2
+description: Settings which control input and output formats.
 ---
 
 import ExperimentalBadge from \'@theme/badges/ExperimentalBadge\';
@@ -105,6 +106,7 @@ title: Session Settings
 sidebar_label: Session Settings
 slug: /operations/settings/settings
 toc_max_heading_level: 2
+description: Settings which are found in the `system.settings` table. 
 ---
 
 import ExperimentalBadge from \'@theme/badges/ExperimentalBadge\';