docs(populate): remove implicit Model.populate() example

Re: #4843

lib/model.js

@@ -2526,8 +2526,8 @@ Model.geoSearch = function(conditions, options, callback) {
  *
  *       User.populate(user, opts, function (err, user) {
  *         console.log(user);
- *       })
- *     })
+ *       });
+ *     });
  *
  *     // populates an array of objects
  *     User.find(match, function (err, users) {
@@ -2540,6 +2540,11 @@ Model.geoSearch = function(conditions, options, callback) {
  *     // imagine a Weapon model exists with two saved documents:
  *     //   { _id: 389, name: 'whip' }
  *     //   { _id: 8921, name: 'boomerang' }
+ *     // and this schema:
+ *     // new Schema({
+ *     //   name: String,
+ *     //   weapon: { type: ObjectId, ref: 'Weapon' }
+ *     // });
  *
  *     var user = { name: 'Indiana Jones', weapon: 389 }
  *     Weapon.populate(user, { path: 'weapon', model: 'Weapon' }, function (err, user) {
@@ -2554,10 +2559,10 @@ Model.geoSearch = function(conditions, options, callback) {
  *         console.log('%s uses a %s', users.name, user.weapon.name)
  *         // Indiana Jones uses a whip
  *         // Batman uses a boomerang
- *       })
- *     })
+ *       });
+ *     });
  *     // Note that we didn't need to specify the Weapon model because
- *     // we were already using it's populate() method.
+ *     // it is in the schema's ref
  *
  * @param {Document|Array} docs Either a single document or array of documents to populate.
  * @param {Object} options A hash of key/val (path, options) used for population.