Fix: made the array actual Ruby, missing commas. [ci skip]

Author: dblock

README.md

@@ -75,10 +75,8 @@ See the official Swagger-UI documentation about [SwaggerUi Parameters](https://g
 GrapeSwaggerRails.options.doc_expansion = 'list'
 ```
 
-You can set supportedSubmitMethods with an array of the supported HTTP methods, default is: 
-```ruby
-["get" "post" "put" "delete" "patch"]
-```
+You can set supportedSubmitMethods with an array of the supported HTTP methods, default is `%w{ get post put delete patch }`.
+
 See the official Swagger-UI documentation about [SwaggerUi Parameters](https://github.com/swagger-api/swagger-ui#parameters).
 
 ```ruby