fix: don't repeat boolean type

Author: gmaclennan

templates/md/boolean-type.ejs

@@ -4,5 +4,4 @@
  * you may not use this file except in compliance with the License. You may obtain a copy
  * of the License at http://www.apache.org/licenses/LICENSE-2.0
  */ %>
-
-`<%=schema.type %>`<%=schema.nullable ? ", nullable" : "" %>
+<%=schema.nullable ? ", nullable" : "" %>