Amplify docs for "import" instruction (#7695)

* Amplify docs for "import" instruction

Signed-off-by: Martin H. Bramwell <martinhbramwell@gmail.com>

* Uses markdown correctly.  Grammar fixed.

Signed-off-by: Martin H. Bramwell <martinhbramwell@gmail.com>

docs/models-definition.md

@@ -581,6 +581,25 @@ sequelize.import('project', (sequelize, DataTypes) => {
 })
 ```
 
+This extra capability is useful when, for example, `Error: Cannot find module` is thrown even though `/path/to/models/project` seems to be correct.  Some frameworks, such as Meteor, overload `require`, and spit out "surprise" results like :
+
+```
+Error: Cannot find module '/home/you/meteorApp/.meteor/local/build/programs/server/app/path/to/models/project.js'
+```
+
+This is solved by passing in Meteor's version of `require`. So, while this probably fails ...
+
+```js
+const AuthorModel = db.import('./path/to/models/project');
+```
+... this should succeed ...
+
+```js
+const AuthorModel = db.import('project', require('./path/to/models/project'));
+```
+
+
+
 ## Optimistic Locking
 
 Sequelize has built-in support for optimistic locking through a model instance version count.