Add missing option (#562)

* Update configuration.mdx

Adding instructions for the overlayClickBehavior configuration option.

* Update docs/src/content/guides/configuration.mdx

Co-authored-by: Jarik Marwede <account@jarikmarwede.com>

* Update docs/src/content/guides/configuration.mdx

Co-authored-by: Jarik Marwede <account@jarikmarwede.com>

---------

Co-authored-by: Jarik Marwede <account@jarikmarwede.com>
Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

Author: 3 people

docs/src/content/guides/configuration.mdx

@@ -33,6 +33,9 @@ type Config = {
   allowClose?: boolean;
   // Opacity of the backdrop. (default: 0.5)
   overlayOpacity?: number;
+  // What to do when the overlay backdrop is clicked.
+  // Possible options are 'close' and 'nextStep'. (default: 'close')
+  overlayClickBehavior?: string,
   // Distance between the highlighted element and the cutout. (default: 10)
   stagePadding?: number;
   // Radius of the cutout around the highlighted element. (default: 5)
@@ -246,4 +249,4 @@ type State = {
   // container, title, description, buttons etc.
   popover?: PopoverDOM;
 }
-```
+```