Slight improvement to documentation
Slight improvement to documentation

`{{#bs-button value=1}}1{{/bs-button}}` was a bit misleading because it happens to work, but if you substitute `1` for a text value, the buttons break. The change to the documentation shows that you should provide a string value to the value attribute.
srvance/ember-bootstrap,jelhan/ember-bootstrap,jelhan/ember-bootstrap,kaliber5/ember-bootstrap,kaliber5/ember-bootstrap,srvance/ember-bootstrap