Merge pull request #503 from buildkite-plugins/SUP-4597-update-the-options-header-in-readme

Update options header in README

Author: Damilola-obasa

README.md

@@ -382,10 +382,12 @@ If set to true, Docker Compose will build with the `--with-dependencies` option
 
 The default is `false`.
 
-#### `builder` (object)
+### `builder` (object)
 
 Defines the properties required for creating, using and removing Builder Instances. If not set, the default Builder Instance on the Agent Instance will be used.
 
+#### `Options to use for configuring builder instances` 
+
 ##### `bootstrap` (boolean)
 
 If set to true, will boot builder instance after creation. Optional when using `create`.