Removed the optional hint from the actual docs.

helm/README.md

@@ -107,7 +107,7 @@ as an example.
 
 | Key | Type | Default | Description |
 |-----|------|---------|-------------|
-| config | object | `{"global":{"max_connections":3,"max_idle_connections":3,"min_interval":"0s","scrape_error_drop_interval":"0s","scrape_timeout":"10s","scrape_timeout_offset":"500ms"}}` | SQL Exporter configuration, can be a dictionary, or a template yaml string. This parameter is optional! |
+| config | object | `{"global":{"max_connections":3,"max_idle_connections":3,"min_interval":"0s","scrape_error_drop_interval":"0s","scrape_timeout":"10s","scrape_timeout_offset":"500ms"}}` | SQL Exporter configuration, can be a dictionary, or a template yaml string. |
 | config.global.scrape_timeout | string | `"10s"` | Scrape timeout |
 | config.global.scrape_timeout_offset | string | `"500ms"` | Scrape timeout offset. Must be strictly positive. |
 | config.global.scrape_error_drop_interval | string | `"0s"` | Interval between dropping scrape_errors_total metric: by default the metric is persistent. |