Update modules/ROOT/partials/configuration/theme_url.adoc

Co-authored-by: Millie <millie.macdonald@tiny.cloud>

Author: kemister85

modules/ROOT/partials/configuration/theme_url.adoc

@@ -1,7 +1,7 @@
 [[theme_url]]
 == `+theme_url+`
 
-This option allows you to specify a custom location for the theme files. Use this option **only** when you need to load the theme files from a location that is not bundled with the core {productname} distribution. The current supportedtheme is called *Silver*.
+This option allows you to specify a custom location for the theme files. Use this option **only** when you need to load the theme files from a location that is not bundled with the core {productname} distribution. The current supported theme is called *Silver*.
 
 *Type:* `+String+`