sample code closing tag compilation error (#1900)
sample code closing tag compilation error (#1900)

1. In `index.hbs ` tag closing compilation error fixed
2. `hasBlock`  example code should call only one time with all the required parameters
skaterdav85/guides,skaterdav85/guides,tleskin/guides,tleskin/guides,skaterdav85/guides,nicobot/guides,skaterdav85/guides,nicobot/guides,tleskin/guides,nicobot/guides