fix permitted roles (#3883)

Author: kathap

docs/v3/source/includes/resources/apps/_clear_buildpack_cache.md.erb

@@ -29,7 +29,7 @@ by a large buildpack cache content.
 `POST /v3/apps/:guid/actions/clear_buildpack_cache`
 
 #### Permitted roles
-|
+ |
 --- |
 Admin |
 Space Developer |