fixed indentation + adapted to markdown syntax

lib/abstract-class.js

@@ -710,8 +710,8 @@ AbstractClass.hasMany = function hasMany(anotherClass, params) {
  * @param {Class} anotherClass - class to belong
  * @param {Object} params - configuration {as: 'propertyName', foreignKey: 'keyName'}
  *
- *  {Usage examples}
- *  Suppose model Post have a {belongsTo} relationship with User (the author of the post). You could declare it this way:
+ * **Usage examples**
+ * Suppose model Post have a *belongsTo* relationship with User (the author of the post). You could declare it this way:
  * Post.belongsTo(User, {as: 'author', foreignKey: 'userId'});
  *
  * When a post is loaded, you can load the related author with: