message: Update heading level for `mainConfiguration`
diff: @@ -727,7 +727,7 @@ Note: `split-top` and `split-bottom` are deprecated values.
  Deprecated. Please use the [`init`](#tasksninit) task instead.
  -### `mainConfiguration`
  +## `mainConfiguration`
  > mainConfiguration is currently in [Beta](/docs/help/public-roadmap/release-cycle). [Send feedback](https://github.com/gitpod-io/gitpod/issues/8623).
  